Has AIS throttled radar fits ?

[RichardS]

thanks for help

There's something odd going on here.

See Crowhurst film thread.

Richard

 

[Genoa]

Do you have hard evidence of this?
In UK waters I would like to think that a ship on passage with AIS Tx off would be taken to task if observed.

Try most Navy vessels -the recent "incident" in Norway for example ...

 

[GHA]

Interesting post from another forum by a big ship driver >>

NEVER are collision avoidance decisions made by relying on AIS data. They often show wrong data/vectors. Plotting is ALWAYS done by ARPA, never by AIS, unless I can not get an echo. In this case I give you a very wide berth.

http://www.cruisersforum.com/forums/f13/a-versus-b-ais-worth-transmitting-211386-6.html#post2783540


The maneuver distance sounds familiar from way offshore watching (the very occasional) ships do a dog leg to give more room based on radar return ( steel boat so good) . Usually done before you see the ship.

Good idea to have a good radar echo.

 

[LadyInBed]

Try most Navy vessels -the recent "incident" in Norway for example ...

When l said ships I was being a bit loose with my definition. Grey jobs are a law unto themselves.
I expect commercial ships to Tx AIS, not necessarily for them to use it to avoid me, but for me to assess what they are up to.

 

[Ningaloo]

Actually one of the great things about AIS is being able identify large ships that are predicted to pass within a hundred metres or so and then watch as they alter course a couple of degrees to avoid you.
I did 7 channel / N. Sea crossings last season and on numerous occasions, a vessel altered course for me (and back again after we were clear).
I don't have a transponder so even without this, it is good to know that there is a good lookout being kept.