<article>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#article09_12_05_1852206</id>
	<title>ISS Can Now Watch Sea Traffic From Space</title>
	<author>timothy</author>
	<datestamp>1260040800000</datestamp>
	<htmltext>gyrogeerloose writes <i>"During its last mission, astronauts from the Space Shuttle <em>Atlantis</em> <a href="http://www.esa.int/SPECIALS/Operations/SEMIHX49J2G\_0.html">installed an Automatic Identification System antenna</a> on the outside of the International Space Station that will allow astronauts aboard the ISS to monitor signals from the AIS transmitters mandated to be installed on most large ocean-going craft. Although these VHF signals can be monitored from the Earth's surface, their horizontal range is generally limited to about 75 km (46 mi), leaving large areas of the ocean unwatched. However, the signals easily reach the 400 km (250 mi) orbit of the ISS. The European Space Agency sees this experiment as a test platform for a future AIS-monitoring fleet of satellites that will eventually provide worldwide coverage of sea traffic."</i></htmltext>
<tokenext>gyrogeerloose writes " During its last mission , astronauts from the Space Shuttle Atlantis installed an Automatic Identification System antenna on the outside of the International Space Station that will allow astronauts aboard the ISS to monitor signals from the AIS transmitters mandated to be installed on most large ocean-going craft .
Although these VHF signals can be monitored from the Earth 's surface , their horizontal range is generally limited to about 75 km ( 46 mi ) , leaving large areas of the ocean unwatched .
However , the signals easily reach the 400 km ( 250 mi ) orbit of the ISS .
The European Space Agency sees this experiment as a test platform for a future AIS-monitoring fleet of satellites that will eventually provide worldwide coverage of sea traffic .
"</tokentext>
<sentencetext>gyrogeerloose writes "During its last mission, astronauts from the Space Shuttle Atlantis installed an Automatic Identification System antenna on the outside of the International Space Station that will allow astronauts aboard the ISS to monitor signals from the AIS transmitters mandated to be installed on most large ocean-going craft.
Although these VHF signals can be monitored from the Earth's surface, their horizontal range is generally limited to about 75 km (46 mi), leaving large areas of the ocean unwatched.
However, the signals easily reach the 400 km (250 mi) orbit of the ISS.
The European Space Agency sees this experiment as a test platform for a future AIS-monitoring fleet of satellites that will eventually provide worldwide coverage of sea traffic.
"</sentencetext>
</article>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_05_1852206.30348156</id>
	<title>Very similar to Ham Radio APRS (one feature of it)</title>
	<author>aberson</author>
	<datestamp>1260110280000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext><p>This is really cool -- Ham radio has been doing almost exactly this <a href="http://www.ariss.net/" title="ariss.net">for years</a> [ariss.net].</p><p>A ground station with nothing more than a 5 Watt handheld VHF transmitter and a regular 19" long antenna can send a position report and message via a number of satellites, including the International Space Station, using a protocol called APRS.  As these are low-earth orbit satellites, you generally only have a few minutes window with each pass, but it's not terribly hard to do and there are a few satellites to potentially catch position data even if you don't get every pass.</p></htmltext>
<tokenext>This is really cool -- Ham radio has been doing almost exactly this for years [ ariss.net ] .A ground station with nothing more than a 5 Watt handheld VHF transmitter and a regular 19 " long antenna can send a position report and message via a number of satellites , including the International Space Station , using a protocol called APRS .
As these are low-earth orbit satellites , you generally only have a few minutes window with each pass , but it 's not terribly hard to do and there are a few satellites to potentially catch position data even if you do n't get every pass .</tokentext>
<sentencetext>This is really cool -- Ham radio has been doing almost exactly this for years [ariss.net].A ground station with nothing more than a 5 Watt handheld VHF transmitter and a regular 19" long antenna can send a position report and message via a number of satellites, including the International Space Station, using a protocol called APRS.
As these are low-earth orbit satellites, you generally only have a few minutes window with each pass, but it's not terribly hard to do and there are a few satellites to potentially catch position data even if you don't get every pass.</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_05_1852206.30338136</id>
	<title>Uses?</title>
	<author>Anonymous</author>
	<datestamp>1260006540000</datestamp>
	<modclass>Interestin</modclass>
	<modscore>1</modscore>
	<htmltext><p>So is this going to be used to find the best spot to crash ISS <b>2 years after it is completed</b>, just in the unlikely chance that large parts reach the ground?</p></htmltext>
<tokenext>So is this going to be used to find the best spot to crash ISS 2 years after it is completed , just in the unlikely chance that large parts reach the ground ?</tokentext>
<sentencetext>So is this going to be used to find the best spot to crash ISS 2 years after it is completed, just in the unlikely chance that large parts reach the ground?</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_05_1852206.30343016</id>
	<title>Re:Why ISS?</title>
	<author>GPSguy</author>
	<datestamp>1260113100000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext><p>It's not cheap but the development lifecycle could well be shorter than for a secondary on an unmanned spacecraft. And, since it's VHF, I guess there's an outside chance that, instead of a dedicated antenna (which wouldn't be too hard) they could have piggybacked on the new (or the remaining old) ARISS antenna.</p><p>Packets in space isn't new by a long-shot and tracking in space isn't, really, either.</p></htmltext>
<tokenext>It 's not cheap but the development lifecycle could well be shorter than for a secondary on an unmanned spacecraft .
And , since it 's VHF , I guess there 's an outside chance that , instead of a dedicated antenna ( which would n't be too hard ) they could have piggybacked on the new ( or the remaining old ) ARISS antenna.Packets in space is n't new by a long-shot and tracking in space is n't , really , either .</tokentext>
<sentencetext>It's not cheap but the development lifecycle could well be shorter than for a secondary on an unmanned spacecraft.
And, since it's VHF, I guess there's an outside chance that, instead of a dedicated antenna (which wouldn't be too hard) they could have piggybacked on the new (or the remaining old) ARISS antenna.Packets in space isn't new by a long-shot and tracking in space isn't, really, either.</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_05_1852206.30338040</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_05_1852206.30340168</id>
	<title>More on Space based AIS</title>
	<author>goatbar</author>
	<datestamp>1260023220000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext>AIS on the IIS is amusing, but not all that helpful. SpaceQuest, ORBCOMM, and COM DEV all have space based AIS systems up...

<ul>
<li> <a href="http://www.enavigation.org/eNavPresentations09.html" title="enavigation.org">eNavigation09</a> [enavigation.org] </li><li> <a href="http://www.gmsa.gov/twiki/bin/view/Main/TexasIII" title="gmsa.gov">TEXAS III (2009)</a> [gmsa.gov] </li><li> <a href="http://www.acq.osd.mil/nsso/ais/texas.htm" title="osd.mil">TEXAS II (2008)</a> [osd.mil] </li></ul></htmltext>
<tokenext>AIS on the IIS is amusing , but not all that helpful .
SpaceQuest , ORBCOMM , and COM DEV all have space based AIS systems up.. . eNavigation09 [ enavigation.org ] TEXAS III ( 2009 ) [ gmsa.gov ] TEXAS II ( 2008 ) [ osd.mil ]</tokentext>
<sentencetext>AIS on the IIS is amusing, but not all that helpful.
SpaceQuest, ORBCOMM, and COM DEV all have space based AIS systems up...


 eNavigation09 [enavigation.org]  TEXAS III (2009) [gmsa.gov]  TEXAS II (2008) [osd.mil] </sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_05_1852206.30372246</id>
	<title>Re:Coverage map</title>
	<author>DavidKlemke</author>
	<datestamp>1260276780000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext><p>AIS data is also used for things like oil spills and search and rescue. When I used to work for the Australian Maritime Safety Authority we had a couple incidents where the AIS data was used to reconstruct the events leading up to the disaster (such as the <a href="http://www.amsa.gov.au/Marine\_Environment\_Protection/Major\_Oil\_Spills\_in\_Australia/Pacific\_Adventurer/index.asp" title="amsa.gov.au" rel="nofollow">pacific adventurer</a> [amsa.gov.au] one earlier this year). They also use it to track any vessels going near the Great Barrier Reef without having a qualified pilot on board (basically someone who knows their way around the reef) so the vessel doesn't crash into anything.</p><p>I can't speak for other countries though, but in Australia we're definitely using AIS data as part of our safety programs.</p></htmltext>
<tokenext>AIS data is also used for things like oil spills and search and rescue .
When I used to work for the Australian Maritime Safety Authority we had a couple incidents where the AIS data was used to reconstruct the events leading up to the disaster ( such as the pacific adventurer [ amsa.gov.au ] one earlier this year ) .
They also use it to track any vessels going near the Great Barrier Reef without having a qualified pilot on board ( basically someone who knows their way around the reef ) so the vessel does n't crash into anything.I ca n't speak for other countries though , but in Australia we 're definitely using AIS data as part of our safety programs .</tokentext>
<sentencetext>AIS data is also used for things like oil spills and search and rescue.
When I used to work for the Australian Maritime Safety Authority we had a couple incidents where the AIS data was used to reconstruct the events leading up to the disaster (such as the pacific adventurer [amsa.gov.au] one earlier this year).
They also use it to track any vessels going near the Great Barrier Reef without having a qualified pilot on board (basically someone who knows their way around the reef) so the vessel doesn't crash into anything.I can't speak for other countries though, but in Australia we're definitely using AIS data as part of our safety programs.</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_05_1852206.30337662</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_05_1852206.30338738</id>
	<title>Re:Innocuous Uses</title>
	<author>icegreentea</author>
	<datestamp>1260011400000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext>If you were going to go do smuggling into Cuba or whatever, you would just turn off your damn AIS transponder. Won't do shit for the radar sweeps they do. But then again, only you Americans keep this embargo up. Ship full of Canadians go near Cuba? Big deal.</htmltext>
<tokenext>If you were going to go do smuggling into Cuba or whatever , you would just turn off your damn AIS transponder .
Wo n't do shit for the radar sweeps they do .
But then again , only you Americans keep this embargo up .
Ship full of Canadians go near Cuba ?
Big deal .</tokentext>
<sentencetext>If you were going to go do smuggling into Cuba or whatever, you would just turn off your damn AIS transponder.
Won't do shit for the radar sweeps they do.
But then again, only you Americans keep this embargo up.
Ship full of Canadians go near Cuba?
Big deal.</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_05_1852206.30337440</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_05_1852206.30337660</id>
	<title>When big brother comes...</title>
	<author>TheModelEskimo</author>
	<datestamp>1260046620000</datestamp>
	<modclass>Funny</modclass>
	<modscore>3</modscore>
	<htmltext>He is gonna be HUGE.</htmltext>
<tokenext>He is gon na be HUGE .</tokentext>
<sentencetext>He is gonna be HUGE.</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_05_1852206.30337868</id>
	<title>I'm pissed</title>
	<author>exsequor</author>
	<datestamp>1260004680000</datestamp>
	<modclass>Funny</modclass>
	<modscore>2</modscore>
	<htmltext>This completely screws up my plans to grow cannabis on my yacht...</htmltext>
<tokenext>This completely screws up my plans to grow cannabis on my yacht.. .</tokentext>
<sentencetext>This completely screws up my plans to grow cannabis on my yacht...</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_05_1852206.30337650</id>
	<title>Tracking coastal AIS vessels</title>
	<author>Snowblindeye</author>
	<datestamp>1260046560000</datestamp>
	<modclass>Informativ</modclass>
	<modscore>4</modscore>
	<htmltext><p>There are several websites that show at least coastal traffic of all AIS equipped vessels. I like <a href="http://www.marinetraffic.com/ais/" title="marinetraffic.com">http://www.marinetraffic.com/ais/</a> [marinetraffic.com] </p></htmltext>
<tokenext>There are several websites that show at least coastal traffic of all AIS equipped vessels .
I like http : //www.marinetraffic.com/ais/ [ marinetraffic.com ]</tokentext>
<sentencetext>There are several websites that show at least coastal traffic of all AIS equipped vessels.
I like http://www.marinetraffic.com/ais/ [marinetraffic.com] </sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_05_1852206.30339352</id>
	<title>Proximity Warning</title>
	<author>Anonymous</author>
	<datestamp>1260015960000</datestamp>
	<modclass>None</modclass>
	<modscore>0</modscore>
	<htmltext><p>That should let them avoid incoming superfreighters... Whait, do we have them on space?</p></htmltext>
<tokenext>That should let them avoid incoming superfreighters... Whait , do we have them on space ?</tokentext>
<sentencetext>That should let them avoid incoming superfreighters... Whait, do we have them on space?</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_05_1852206.30337440</id>
	<title>Innocuous Uses</title>
	<author>Anonymous</author>
	<datestamp>1260045120000</datestamp>
	<modclass>None</modclass>
	<modscore>0</modscore>
	<htmltext>So any bets on how long it'll take them to find a nefarious use for this? Like spying on any private boats passing within x leagues of Cuba? [/paranoia]</htmltext>
<tokenext>So any bets on how long it 'll take them to find a nefarious use for this ?
Like spying on any private boats passing within x leagues of Cuba ?
[ /paranoia ]</tokentext>
<sentencetext>So any bets on how long it'll take them to find a nefarious use for this?
Like spying on any private boats passing within x leagues of Cuba?
[/paranoia]</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_05_1852206.30339188</id>
	<title>Re:Why ISS?</title>
	<author>TooMuchToDo</author>
	<datestamp>1260014880000</datestamp>
	<modclass>Insightful</modclass>
	<modscore>3</modscore>
	<htmltext>They we're going there anyway? In essence, they *are* just piggybacking on a bigger launch (the shuttle's primary mission). Your only cost is the EVA time, cost of the device/antenna, and the additional weight for launch.</htmltext>
<tokenext>They we 're going there anyway ?
In essence , they * are * just piggybacking on a bigger launch ( the shuttle 's primary mission ) .
Your only cost is the EVA time , cost of the device/antenna , and the additional weight for launch .</tokentext>
<sentencetext>They we're going there anyway?
In essence, they *are* just piggybacking on a bigger launch (the shuttle's primary mission).
Your only cost is the EVA time, cost of the device/antenna, and the additional weight for launch.</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_05_1852206.30338040</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_05_1852206.30337834</id>
	<title>As a somlian sea pirate</title>
	<author>Anonymous</author>
	<datestamp>1260004500000</datestamp>
	<modclass>None</modclass>
	<modscore>0</modscore>
	<htmltext><p>I welcome the new AIS overlords..  Booty here I come!</p></htmltext>
<tokenext>I welcome the new AIS overlords.. Booty here I come !</tokentext>
<sentencetext>I welcome the new AIS overlords..  Booty here I come!</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_05_1852206.30342118</id>
	<title>Next financial Crash</title>
	<author>kramulous</author>
	<datestamp>1260096780000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext><p>Cool<nobr> <wbr></nobr>... use it to predict the next financial crash.</p></htmltext>
<tokenext>Cool ... use it to predict the next financial crash .</tokentext>
<sentencetext>Cool ... use it to predict the next financial crash.</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_05_1852206.30339104</id>
	<title>Re:Coverage map</title>
	<author>enosys</author>
	<datestamp>1260014340000</datestamp>
	<modclass>Informativ</modclass>
	<modscore>2</modscore>
	<htmltext>Inaccurate.
<p>That's just the coverage available on one particular website.  (Other sites can have different data sources and different coverage.)  Also, those rectangles just mean that there is some coverage within the rectangle.  (Often, coverage is available around larger cities and a lot of the area is not covered.)
</p><p>Furthermore, AIS is sometimes used for collision avoidance, so it is used for safety.</p></htmltext>
<tokenext>Inaccurate .
That 's just the coverage available on one particular website .
( Other sites can have different data sources and different coverage .
) Also , those rectangles just mean that there is some coverage within the rectangle .
( Often , coverage is available around larger cities and a lot of the area is not covered .
) Furthermore , AIS is sometimes used for collision avoidance , so it is used for safety .</tokentext>
<sentencetext>Inaccurate.
That's just the coverage available on one particular website.
(Other sites can have different data sources and different coverage.
)  Also, those rectangles just mean that there is some coverage within the rectangle.
(Often, coverage is available around larger cities and a lot of the area is not covered.
)
Furthermore, AIS is sometimes used for collision avoidance, so it is used for safety.</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_05_1852206.30337662</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_05_1852206.30337860</id>
	<title>Why don't they...</title>
	<author>Anonymous</author>
	<datestamp>1260004620000</datestamp>
	<modclass>None</modclass>
	<modscore>0</modscore>
	<htmltext><p>just turn the antenna's on their side if the horizontal range is so crappy?!</p></htmltext>
<tokenext>just turn the antenna 's on their side if the horizontal range is so crappy ?
!</tokentext>
<sentencetext>just turn the antenna's on their side if the horizontal range is so crappy?
!</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_05_1852206.30337680</id>
	<title>AIS from space?</title>
	<author>Anonymous</author>
	<datestamp>1260046740000</datestamp>
	<modclass>None</modclass>
	<modscore>0</modscore>
	<htmltext><p>http://www.orbcomm.com/ais/ais.htm</p></htmltext>
<tokenext>http : //www.orbcomm.com/ais/ais.htm</tokentext>
<sentencetext>http://www.orbcomm.com/ais/ais.htm</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_05_1852206.30337602</id>
	<title>Protocol Issues?</title>
	<author>Anonymous</author>
	<datestamp>1260046380000</datestamp>
	<modclass>None</modclass>
	<modscore>0</modscore>
	<htmltext><p>AIS uses a distributed TDMA algorithm to assign transmission slots to ships on two different frequencies. This implicitly assumes a limited range of transmission, so the ISS will potentially see several ships transmitting in the same timeslot from widely space ships on the ocean. I don't think this resolves itself by random re-assignment in subsequent transmissions either. It will be interesting to see how successful this is in practice.</p></htmltext>
<tokenext>AIS uses a distributed TDMA algorithm to assign transmission slots to ships on two different frequencies .
This implicitly assumes a limited range of transmission , so the ISS will potentially see several ships transmitting in the same timeslot from widely space ships on the ocean .
I do n't think this resolves itself by random re-assignment in subsequent transmissions either .
It will be interesting to see how successful this is in practice .</tokentext>
<sentencetext>AIS uses a distributed TDMA algorithm to assign transmission slots to ships on two different frequencies.
This implicitly assumes a limited range of transmission, so the ISS will potentially see several ships transmitting in the same timeslot from widely space ships on the ocean.
I don't think this resolves itself by random re-assignment in subsequent transmissions either.
It will be interesting to see how successful this is in practice.</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_05_1852206.30339112</id>
	<title>Re:Innocuous Uses</title>
	<author>Anonymous</author>
	<datestamp>1260014340000</datestamp>
	<modclass>None</modclass>
	<modscore>0</modscore>
	<htmltext><p>Private boats don't have AIS transponders (typically).  Although the owner could have one installed (they are no more complicated than a VHF radio that most boats/ships have - and they kind of look like one).  Switching it off is as easy as turning off a TV.  AIS is a convenience device for shipping companies, port/harbor personnel, and other commercial maritime industries.  It is usually interfaced with the ship's electronic charting/navigation/autopilot and radar and helps the ship get an idea of the big picture by allowing the navigation team and the piloting team to see the same picture in an electronic sense.  It also allows passively assists with inter-ship coordination to help prevent collisions.  Lastly, large shipping companies can keep tabs on where it's ship's are w/o having to call them up.</p><p>When a ship goes down and the crew is abandoning ship/lowering life rafts, etc. the AIS system will continue to provide position and other distress info as long as it still has power.  The particular AIS system I used had both a distress function and a Man-Over-Board (MOB) function.</p><p>The US and it's allies keep a relatively accurate picture of all the vessels moving around the northern Atlantic Ocean, Mediterranean, Red/Persian Gulfs and Arabian Sea.  Although the International Maritime Organization has mandated it's use for SHIPs over 300 tons or passenger SHIPs, boats are not required to use AIS (as anyone with a boat could tell you).  Although AIS is used by the military to assist with that picture, the data AIS broadcasts is easily changed - literally you can make it say whatever you want.  The navies of the world know that AIS info cannot be trusted.</p><p>Seeing large ships go by w/o any AIS data or wrong data (wrong ship name, location data that puts them hundreds of NM away, etc) was nearly as common seeing a ship with completely valid info.</p></htmltext>
<tokenext>Private boats do n't have AIS transponders ( typically ) .
Although the owner could have one installed ( they are no more complicated than a VHF radio that most boats/ships have - and they kind of look like one ) .
Switching it off is as easy as turning off a TV .
AIS is a convenience device for shipping companies , port/harbor personnel , and other commercial maritime industries .
It is usually interfaced with the ship 's electronic charting/navigation/autopilot and radar and helps the ship get an idea of the big picture by allowing the navigation team and the piloting team to see the same picture in an electronic sense .
It also allows passively assists with inter-ship coordination to help prevent collisions .
Lastly , large shipping companies can keep tabs on where it 's ship 's are w/o having to call them up.When a ship goes down and the crew is abandoning ship/lowering life rafts , etc .
the AIS system will continue to provide position and other distress info as long as it still has power .
The particular AIS system I used had both a distress function and a Man-Over-Board ( MOB ) function.The US and it 's allies keep a relatively accurate picture of all the vessels moving around the northern Atlantic Ocean , Mediterranean , Red/Persian Gulfs and Arabian Sea .
Although the International Maritime Organization has mandated it 's use for SHIPs over 300 tons or passenger SHIPs , boats are not required to use AIS ( as anyone with a boat could tell you ) .
Although AIS is used by the military to assist with that picture , the data AIS broadcasts is easily changed - literally you can make it say whatever you want .
The navies of the world know that AIS info can not be trusted.Seeing large ships go by w/o any AIS data or wrong data ( wrong ship name , location data that puts them hundreds of NM away , etc ) was nearly as common seeing a ship with completely valid info .</tokentext>
<sentencetext>Private boats don't have AIS transponders (typically).
Although the owner could have one installed (they are no more complicated than a VHF radio that most boats/ships have - and they kind of look like one).
Switching it off is as easy as turning off a TV.
AIS is a convenience device for shipping companies, port/harbor personnel, and other commercial maritime industries.
It is usually interfaced with the ship's electronic charting/navigation/autopilot and radar and helps the ship get an idea of the big picture by allowing the navigation team and the piloting team to see the same picture in an electronic sense.
It also allows passively assists with inter-ship coordination to help prevent collisions.
Lastly, large shipping companies can keep tabs on where it's ship's are w/o having to call them up.When a ship goes down and the crew is abandoning ship/lowering life rafts, etc.
the AIS system will continue to provide position and other distress info as long as it still has power.
The particular AIS system I used had both a distress function and a Man-Over-Board (MOB) function.The US and it's allies keep a relatively accurate picture of all the vessels moving around the northern Atlantic Ocean, Mediterranean, Red/Persian Gulfs and Arabian Sea.
Although the International Maritime Organization has mandated it's use for SHIPs over 300 tons or passenger SHIPs, boats are not required to use AIS (as anyone with a boat could tell you).
Although AIS is used by the military to assist with that picture, the data AIS broadcasts is easily changed - literally you can make it say whatever you want.
The navies of the world know that AIS info cannot be trusted.Seeing large ships go by w/o any AIS data or wrong data (wrong ship name, location data that puts them hundreds of NM away, etc) was nearly as common seeing a ship with completely valid info.</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_05_1852206.30337440</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_05_1852206.30337670</id>
	<title>No surprise really</title>
	<author>Anonymous</author>
	<datestamp>1260046680000</datestamp>
	<modclass>Informativ</modclass>
	<modscore>2</modscore>
	<htmltext><p>This is a pretty common and extremely cheap sensor to put in space. Multiple tiny satellites have demonstrated the utility of an AIS sensor in space.</p><p>In space these are mainly used to track ships who might be up to no good on open water. Also you can fuse the data with radar satellite wake detection, any detected ship with their signal turned off also might be up to no good. Canada is doing just this with M3MSat and Radarsat-2</p></htmltext>
<tokenext>This is a pretty common and extremely cheap sensor to put in space .
Multiple tiny satellites have demonstrated the utility of an AIS sensor in space.In space these are mainly used to track ships who might be up to no good on open water .
Also you can fuse the data with radar satellite wake detection , any detected ship with their signal turned off also might be up to no good .
Canada is doing just this with M3MSat and Radarsat-2</tokentext>
<sentencetext>This is a pretty common and extremely cheap sensor to put in space.
Multiple tiny satellites have demonstrated the utility of an AIS sensor in space.In space these are mainly used to track ships who might be up to no good on open water.
Also you can fuse the data with radar satellite wake detection, any detected ship with their signal turned off also might be up to no good.
Canada is doing just this with M3MSat and Radarsat-2</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_05_1852206.30338040</id>
	<title>Why ISS?</title>
	<author>Anonymous</author>
	<datestamp>1260005880000</datestamp>
	<modclass>Interestin</modclass>
	<modscore>3</modscore>
	<htmltext>Anyone knows what are the advantages of using ISS for this kind of test? I would be interested to see what it costs to send such an antenna up with the shuttle, test that it does not interfere with the rest of the station and train an astronaut to fix it to the exterior, versus just slapping it as secondary payload on some other satellite or even some dedicated micro-satellite that is piggybacking on the launch of a bigger one.</htmltext>
<tokenext>Anyone knows what are the advantages of using ISS for this kind of test ?
I would be interested to see what it costs to send such an antenna up with the shuttle , test that it does not interfere with the rest of the station and train an astronaut to fix it to the exterior , versus just slapping it as secondary payload on some other satellite or even some dedicated micro-satellite that is piggybacking on the launch of a bigger one .</tokentext>
<sentencetext>Anyone knows what are the advantages of using ISS for this kind of test?
I would be interested to see what it costs to send such an antenna up with the shuttle, test that it does not interfere with the rest of the station and train an astronaut to fix it to the exterior, versus just slapping it as secondary payload on some other satellite or even some dedicated micro-satellite that is piggybacking on the launch of a bigger one.</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_05_1852206.30342438</id>
	<title>Re:Coverage map</title>
	<author>Anonymous</author>
	<datestamp>1260103020000</datestamp>
	<modclass>None</modclass>
	<modscore>0</modscore>
	<htmltext><p>You have to remember that sites such as marinetraffic base their data on AIS receivers often belonging to private individuals that release this data to these sites. Coverage is based upon the amount of people willing to share their data, there are for pay sites which offer a much denser coverage of the world but they require a monthly fee. Often these pay sites also work with private individuals for data but instead these people get free equipment and free access to the sites.</p></htmltext>
<tokenext>You have to remember that sites such as marinetraffic base their data on AIS receivers often belonging to private individuals that release this data to these sites .
Coverage is based upon the amount of people willing to share their data , there are for pay sites which offer a much denser coverage of the world but they require a monthly fee .
Often these pay sites also work with private individuals for data but instead these people get free equipment and free access to the sites .</tokentext>
<sentencetext>You have to remember that sites such as marinetraffic base their data on AIS receivers often belonging to private individuals that release this data to these sites.
Coverage is based upon the amount of people willing to share their data, there are for pay sites which offer a much denser coverage of the world but they require a monthly fee.
Often these pay sites also work with private individuals for data but instead these people get free equipment and free access to the sites.</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_05_1852206.30337662</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_05_1852206.30337656</id>
	<title>Re:Where else...</title>
	<author>TheModelEskimo</author>
	<datestamp>1260046560000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext>Outer space.</htmltext>
<tokenext>Outer space .</tokentext>
<sentencetext>Outer space.</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_05_1852206.30337446</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_05_1852206.30339012</id>
	<title>The orbit?</title>
	<author>argent</author>
	<datestamp>1260013800000</datestamp>
	<modclass>Interestin</modclass>
	<modscore>2</modscore>
	<htmltext><p>The ISS operates at a relatively low orbit, even for LEO... for example the Iridium constellation is about twice the ISS' altitude (760km vs 350km). They'd have to find a mission that's within the 400km range of the system, and that has room and power to spare.</p></htmltext>
<tokenext>The ISS operates at a relatively low orbit , even for LEO... for example the Iridium constellation is about twice the ISS ' altitude ( 760km vs 350km ) .
They 'd have to find a mission that 's within the 400km range of the system , and that has room and power to spare .</tokentext>
<sentencetext>The ISS operates at a relatively low orbit, even for LEO... for example the Iridium constellation is about twice the ISS' altitude (760km vs 350km).
They'd have to find a mission that's within the 400km range of the system, and that has room and power to spare.</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_05_1852206.30338040</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_05_1852206.30337446</id>
	<title>Where else...</title>
	<author>skine</author>
	<datestamp>1260045180000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext><p>Where else would they be watching sea traffic from?</p></htmltext>
<tokenext>Where else would they be watching sea traffic from ?</tokentext>
<sentencetext>Where else would they be watching sea traffic from?</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_05_1852206.30338062</id>
	<title>Get to the point.</title>
	<author>Anonymous</author>
	<datestamp>1260005940000</datestamp>
	<modclass>None</modclass>
	<modscore>0</modscore>
	<htmltext>How can this technology be leveraged to keep my children safe?</htmltext>
<tokenext>How can this technology be leveraged to keep my children safe ?</tokentext>
<sentencetext>How can this technology be leveraged to keep my children safe?</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_05_1852206.30337376</id>
	<title>Mah Dick</title>
	<author>Anonymous</author>
	<datestamp>1260044760000</datestamp>
	<modclass>Troll</modclass>
	<modscore>-1</modscore>
	<htmltext>is sort of like a sperm whale.</htmltext>
<tokenext>is sort of like a sperm whale .</tokentext>
<sentencetext>is sort of like a sperm whale.</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_05_1852206.30337444</id>
	<title>Crap</title>
	<author>Anonymous</author>
	<datestamp>1260045120000</datestamp>
	<modclass>Funny</modclass>
	<modscore>5</modscore>
	<htmltext>How long before I get pulled over for speeding in the trade lanes?</htmltext>
<tokenext>How long before I get pulled over for speeding in the trade lanes ?</tokentext>
<sentencetext>How long before I get pulled over for speeding in the trade lanes?</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_05_1852206.30338824</id>
	<title>Like we didn't already have this capability?</title>
	<author>Anonymous</author>
	<datestamp>1260012180000</datestamp>
	<modclass>None</modclass>
	<modscore>0</modscore>
	<htmltext><p>It's so cute the way folks think this is some new capability. "National assets" FTW.</p></htmltext>
<tokenext>It 's so cute the way folks think this is some new capability .
" National assets " FTW .</tokentext>
<sentencetext>It's so cute the way folks think this is some new capability.
"National assets" FTW.</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_05_1852206.30338078</id>
	<title>Re:Where else...</title>
	<author>Winkhorst</author>
	<datestamp>1260006120000</datestamp>
	<modclass>Interestin</modclass>
	<modscore>3</modscore>
	<htmltext>They're already watching sea traffic from space. What this does is allow them to quickly remove "legitimate" traffic from the database so they can focus on traffic that's antithetical to the Empire.</htmltext>
<tokenext>They 're already watching sea traffic from space .
What this does is allow them to quickly remove " legitimate " traffic from the database so they can focus on traffic that 's antithetical to the Empire .</tokentext>
<sentencetext>They're already watching sea traffic from space.
What this does is allow them to quickly remove "legitimate" traffic from the database so they can focus on traffic that's antithetical to the Empire.</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_05_1852206.30337446</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_05_1852206.30341540</id>
	<title>This isn't the first AIS from a spacecraft...</title>
	<author>Anonymous</author>
	<datestamp>1260041400000</datestamp>
	<modclass>None</modclass>
	<modscore>0</modscore>
	<htmltext><p>There are several other spacecraft that have come long before this ISS experiment that proved the concept of AIS from space; Canada has had one up for a while, several US satellites including ORBCOM provide this capability (for a fee) as well as the experimental payload on TacSat-2.   Many papers have been written and presented at conferences such as the 4S Conference as well as the Utah State/AIAA Small Satellite Conference...</p></htmltext>
<tokenext>There are several other spacecraft that have come long before this ISS experiment that proved the concept of AIS from space ; Canada has had one up for a while , several US satellites including ORBCOM provide this capability ( for a fee ) as well as the experimental payload on TacSat-2 .
Many papers have been written and presented at conferences such as the 4S Conference as well as the Utah State/AIAA Small Satellite Conference.. .</tokentext>
<sentencetext>There are several other spacecraft that have come long before this ISS experiment that proved the concept of AIS from space; Canada has had one up for a while, several US satellites including ORBCOM provide this capability (for a fee) as well as the experimental payload on TacSat-2.
Many papers have been written and presented at conferences such as the 4S Conference as well as the Utah State/AIAA Small Satellite Conference...</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_05_1852206.30337770</id>
	<title>Re:Crap</title>
	<author>Anonymous</author>
	<datestamp>1260004140000</datestamp>
	<modclass>Funny</modclass>
	<modscore>4</modscore>
	<htmltext><p>"Speed Limit Enforced By Spacecraft."</p><p>I can't wait to see the icon on the sign.<nobr> <wbr></nobr>... not to mention the defense attorneys going for the relativistic measurement argument.  "Your Honor, we would like to question the prosecution's derivation of gamma."</p></htmltext>
<tokenext>" Speed Limit Enforced By Spacecraft .
" I ca n't wait to see the icon on the sign .
... not to mention the defense attorneys going for the relativistic measurement argument .
" Your Honor , we would like to question the prosecution 's derivation of gamma .
"</tokentext>
<sentencetext>"Speed Limit Enforced By Spacecraft.
"I can't wait to see the icon on the sign.
... not to mention the defense attorneys going for the relativistic measurement argument.
"Your Honor, we would like to question the prosecution's derivation of gamma.
"</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_05_1852206.30337444</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_05_1852206.30341340</id>
	<title>Re:Crap</title>
	<author>physburn</author>
	<datestamp>1260038220000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext>Hopefully an international treaty which would let any government police
sea traffic for speed will never happen. Meantime the space antenna
can help prevent collisions by setting a sea traffic control, with an
early warning system for ships that get to close, it needn't be that
quick, oil tankers and stopped times of the order an hour!
<p>
---
</p><p>
<a href="http://www.feeddistiller.com/blogs/space\%20craft/feed.html" title="feeddistiller.com">Space Craft</a> [feeddistiller.com] Feed @ <a href="http://www.feeddistiller.com/" title="feeddistiller.com">Feed Distiller</a> [feeddistiller.com]</p></htmltext>
<tokenext>Hopefully an international treaty which would let any government police sea traffic for speed will never happen .
Meantime the space antenna can help prevent collisions by setting a sea traffic control , with an early warning system for ships that get to close , it need n't be that quick , oil tankers and stopped times of the order an hour !
--- Space Craft [ feeddistiller.com ] Feed @ Feed Distiller [ feeddistiller.com ]</tokentext>
<sentencetext>Hopefully an international treaty which would let any government police
sea traffic for speed will never happen.
Meantime the space antenna
can help prevent collisions by setting a sea traffic control, with an
early warning system for ships that get to close, it needn't be that
quick, oil tankers and stopped times of the order an hour!
---

Space Craft [feeddistiller.com] Feed @ Feed Distiller [feeddistiller.com]</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_05_1852206.30337444</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_05_1852206.30339142</id>
	<title>Re:Innocuous Uses</title>
	<author>RobVB</author>
	<datestamp>1260014580000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext>I'm pretty sure most smuggling between Cuba and the US is done on small yachts that don't even have AIS.

From <a href="http://www.uais.org/AISandnon-SOLASvessels.htm" title="uais.org">this page</a> [uais.org]:<p><div class="quote"><p>IMO has made carriage of AIS mandatory in the recently revised SOLAS chapter V, for all new ships over 300 GRT, from July 1, 2002, and existing ships to follow in a tight schedule there after (see attached).</p></div><p>If you want to work out exactly how big a 300 GRT yacht would be, check out <a href="http://en.wikipedia.org/wiki/Tonnage" title="wikipedia.org">this Wikipedia page</a> [wikipedia.org].</p></div>
	</htmltext>
<tokenext>I 'm pretty sure most smuggling between Cuba and the US is done on small yachts that do n't even have AIS .
From this page [ uais.org ] : IMO has made carriage of AIS mandatory in the recently revised SOLAS chapter V , for all new ships over 300 GRT , from July 1 , 2002 , and existing ships to follow in a tight schedule there after ( see attached ) .If you want to work out exactly how big a 300 GRT yacht would be , check out this Wikipedia page [ wikipedia.org ] .</tokentext>
<sentencetext>I'm pretty sure most smuggling between Cuba and the US is done on small yachts that don't even have AIS.
From this page [uais.org]:IMO has made carriage of AIS mandatory in the recently revised SOLAS chapter V, for all new ships over 300 GRT, from July 1, 2002, and existing ships to follow in a tight schedule there after (see attached).If you want to work out exactly how big a 300 GRT yacht would be, check out this Wikipedia page [wikipedia.org].
	</sentencetext>
	<parent>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_05_1852206.30338738</parent>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_05_1852206.30337662</id>
	<title>Coverage map</title>
	<author>Anonymous</author>
	<datestamp>1260046680000</datestamp>
	<modclass>Informativ</modclass>
	<modscore>4</modscore>
	<htmltext><p>
Here's the
<a href="http://www.marinetraffic.com/ais/" title="marinetraffic.com">map of existing coverage.</a> [marinetraffic.com] The continental US, Europe, and Japan,  have full coastal coverage.  The port coasts of China and Australia are covered.  Beyond that, not so much.
</p><p>
This isn't a safety system.  It's for traffic and port management.  Vessels show up in the system around the time when ports need to start thinking about where to put them.</p></htmltext>
<tokenext>Here 's the map of existing coverage .
[ marinetraffic.com ] The continental US , Europe , and Japan , have full coastal coverage .
The port coasts of China and Australia are covered .
Beyond that , not so much .
This is n't a safety system .
It 's for traffic and port management .
Vessels show up in the system around the time when ports need to start thinking about where to put them .</tokentext>
<sentencetext>
Here's the
map of existing coverage.
[marinetraffic.com] The continental US, Europe, and Japan,  have full coastal coverage.
The port coasts of China and Australia are covered.
Beyond that, not so much.
This isn't a safety system.
It's for traffic and port management.
Vessels show up in the system around the time when ports need to start thinking about where to put them.</sentencetext>
</comment>
<comment>
	<id>http://www.semanticweb.org/ontologies/ConversationInstances.owl#comment09_12_05_1852206.30337676</id>
	<title>Hmmm...this is coming..</title>
	<author>mace9984</author>
	<datestamp>1260046740000</datestamp>
	<modclass>None</modclass>
	<modscore>1</modscore>
	<htmltext>Insert obligatory foil hat quip here.</htmltext>
<tokenext>Insert obligatory foil hat quip here .</tokentext>
<sentencetext>Insert obligatory foil hat quip here.</sentencetext>
</comment>
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