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jamesmc
ROVworld Admin
Joined: Dec 11, 2003
Posts: 3021
Location: Sooke, BC, Canada
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 Posted: 17:47 Tue 01 Jun 10 |
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skate
Member
Joined: Jun 16, 2005
Posts: 26
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| Posted: 13:22 Wed 02 Jun 10 |
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been using this for a while. Handy little tool, although doesn't cover all areas.
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gr8
Member
Joined: Aug 28, 2008
Posts: 63
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| Posted: 16:58 Wed 02 Jun 10 |
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| skate wrote: |
| been using this for a while. Handy little tool, although doesn't cover all areas. |
Really? For example which areas...?
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iROV
Member
Joined: Jun 26, 2009
Posts: 79
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| Posted: 17:16 Wed 02 Jun 10 |
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Vessel tracking capabilities seems to be limited to coastal areas.
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gr8
Member
Joined: Aug 28, 2008
Posts: 63
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| Posted: 20:02 Wed 02 Jun 10 |
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All vessel tracking web pages are limited to coastal areas. They are using AIS system and as all of us know, AIS is working on UKF freq., so it depends of the high of antenna - the range is usually a few miles but sometimes, during the very good conditions it could be up to 150 miles.
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baglimit
Member
Joined: Nov 01, 2007
Posts: 67
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| Posted: 22:09 Wed 02 Jun 10 |
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http://www.aisliverpool.org.uk/traffic.php?map=uk
ive preferred this one for north sea watching - more info
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jamesmc
ROVworld Admin
Joined: Dec 11, 2003
Posts: 3021
Location: Sooke, BC, Canada
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| Posted: 02:12 Thu 03 Jun 10 |
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The International Maritime Organization's (IMO) International Convention for the Safety of Life at Sea (SOLAS) requires AIS to be fitted aboard international voyaging ships with gross tonnage (GT) of 300 or more tons, and all passenger ships regardless of size. It is estimated that more than 40,000 ships currently carry AIS class A equipment.
Ships outside AIS radio range can be tracked with the Long Range Identification and Tracking (LRIT) system with less frequent transmission.
AIS Range limitations and space-based tracking
Shipboard AIS transponders have a horizontal range that is highly variable but typically only about 74 kilometers (46 mi). They reach much further vertically, up to the 400 km orbit of the International Space Station (ISS).
In November 2009, the STS-129 space shuttle mission attached two antennas - an AIS VHF antenna, and an Amateur Radio antenna to the Columbus module of the ISS. Both antennas were built in cooperation between ESA and the ARISS team (Amateur Radio on ISS). Starting from May 2010 the European Space Agency is testing two different AIS receivers, one from Luxspace (GdL), one from FFI (Norway) in the frame of technology demonstration for space-based ship monitoring. This is a first step towards a satellite-based AIS-monitoring service.[4]
In 2008, ORBCOMM launched new low-earth orbit (LEO) satellites, equipped with the capability to collect AIS data. Additionally, ORBCOMM has incorporated the ability to receive, collect and forward AIS data in the design of the next 18 ORBCOMM Generation 2 (0G2) satellites under development. As additional satellites are launched, ORBCOMM will increase its capability by providing greater redundancy and more frequent updates of AIS data.[5] In 2009, LUXSPACE, a Grand Duchy of Luxembourg based company has launched PathFinder2, (ex-Rubin) and is now the only European company to have an operational system in orbit providing data from all over the world on a daily basis. The satellite is operated in cooperation with SES ASTRA and REDU Space Services. [6] In 2007, a previous test of space-based AIS tracking by the U.S. TacSat-2 satellite suffered from signal corruption because the many AIS signals interfered with each other.
http://en.wikipedia.org/wiki/Automatic_Identification_System
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skate
Member
Joined: Jun 16, 2005
Posts: 26
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| Posted: 13:58 Thu 03 Jun 10 |
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| gr8 wrote: |
| skate wrote: |
| been using this for a while. Handy little tool, although doesn't cover all areas. |
Really? For example which areas...? |
You need an AIS receiver and then have to transmit it so it can get on the site. Changi in Singapore is one of the areas not covered.
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sitrep69
Member
Joined: Nov 13, 2009
Posts: 162
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| Posted: 21:40 Fri 11 Jun 10 |
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http://www.marinetraffic.com/ais/addyourarea.aspx?level1=150#3
I have been using the marine traffic website for a couple of months now and find it pretty good. So good that I have actually queried bridge staff on different vessels when I've joined them if there transceiver is operating when I haven't been able to locate them.
There does seem to be an alternate way of providing/decoding AIS data by using a VHF radio and a computer, something that I have considered as my own "small" boat has a VHF radio (Ch 87).
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DANFROV
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Joined: Dec 14, 2003
Posts: 312
Location: Scotland
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| Posted: 20:08 Tue 27 Jul 10 |
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Rons_ROV_Links
ROVworld Webteam
Joined: Dec 12, 2003
Posts: 599
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| Posted: 03:53 Wed 28 Jul 10 |
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Also a nice AIS tracking website: http://aprs.fi/
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Rons_ROV_Links
ROVworld Webteam
Joined: Dec 12, 2003
Posts: 599
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| Posted: 03:56 Wed 28 Jul 10 |
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And this is a Norwegian AIS tracker from NavCom: http://www.navcom.no/aislive/index.aspx?myid=1
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