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Old 23-04-2010, 09:03   #31
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Originally Posted by donradcliffe View Post
AIS transponders are getting more popular by the week--I just passed English Harbor in Antigua, and picked up 36 transponders--all from yachts. If this trend continues, I can see where the commerical shipping would use a filter near ports--I just hope they remember to turn it off in the open sea.
Let me point out that there is no "ignore Class-B" filter.

Some hobbyist programs let you do this, but the AIS systems in use on ships do not ignore Class-B. They may filter out stopped and otherwise non-threatening targets, but that's about it. Some older systems will not decode the Class-B "static" information (vessel name, callsign, dimensions), but they all properly decode position/course/speed for Class-B vessels. Newer systems decode it all.
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Old 23-04-2010, 09:29   #32
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Originally Posted by Paul Elliott View Post
Let me point out that there is no "ignore Class-B" filter.

Some hobbyist programs let you do this, but the AIS systems in use on ships do not ignore Class-B. They may filter out stopped and otherwise non-threatening targets, but that's about it. Some older systems will not decode the Class-B "static" information (vessel name, callsign, dimensions), but they all properly decode position/course/speed for Class-B vessels. Newer systems decode it all.
Not quite true Paul. SeaPro PC chartplotter by Euronav (for one) does have a class B display filter, and it's certainly not a hobbyist program.

I also found that my early version single channel NASA AIS rx didn't receive any class B transmissions.
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