Big ship and no AIS on your screen.

Scotty_Twister said:
Any vessel over 300T should by law be transmitting I believe....
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I would like to correct the above:

"Every vessel over 300 Tonnes AND every commercial vessel".

So even a small Nelson 42 converted and being used as a dive boat for commercial diving with 4 or so amateur divers on boards need to carry and operated AIS. This amendment was added about 12 months ago, the bit about "every commercial vessel".
HM Ships, by their very nature of the job they do, are not really required to display AIS info but in peacetime . . . . :)
 
It is correct that even passenger vessels below 300 tonnes must transmit AIS signals, UNLESS it is only doing national voyages. This means of course that you can meet lots of local ferrys or charter vessels not displaying on your screen.
Regarding ROT: Rate of turn is not being displayed if the vessel only has the COG information from GPS available.
If the vessels displays heading information from compass or gyro, it may display ROT information
Michael
 
A guy at the SBS said that he wouldn't bother with radar as AIS would show where ships were. My son, who is a third officer aboard a ship, says that he thinks that at least 10% of ships have their AIS turned off, or not working for some reason. So don't rely on ships showing up on AIS!
 
What would be the correct response to seeing a large ship in your vicinity
but not seeing an AIS message/icon on your screen?
Should one call the Coast Guard or try to raise the ship on VHF
even if it's name could be read?


Clearly if you are an "electronic" sailor/navigator then the ship does not exist so you should proceed accordingly and sail through it. On the other hand you could regret not spending the extra on a proper radar.
 
LadyInBed said:
If there is no AIS and it's not on the Radar it could be the Mary Celeste :eek:
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The only Mary I've had on AIS recently was the Queen Mary as she slipped by Bembridge two weeks ago.
She was doing just over 9 knots and looked really graceful as she went on her way to Capetown.

p.s.
Did that old Colvic make it across to the other side then? There didn't seem enough wind to move her old bones when you were due to go.
I sailed with a friend when he had one and it was built like an outhouse, + strong, comfortable in a sea, but not very fast.
:-)
 
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It all comes down to "are you going to believe what you see or what the AIS system tells you" as others have said AIS is a good technology BUT with massive limitations not least it relies on the actions of someone else to make it work for you - and its not switched on by everyone who has it so at the momement its no good, relegated to the level of a novel chocolate teapot used to store boiled sweets. eyeballs and radar are still the only sensible options - but that could change if AIS became believable. oops thats one "if" too many. .
 
AIS contacts.

Thanks for the interesting replies.
WOODHOUSE : I have an integrated Raymarine setup with a c80 screen;
AIS 250 and radar.
Scotty Twister : My boat is berthed in the Solent near Fawley so there
is always a large number of AIS contacts esp tankers on or near the refinery
and all of the ferries to and fro the I.O.W. so the system is working.
TWISTER KEN : Did "Ouzo" see it coming? I just like to use all possible
information to keep me out of trouble.

Perhaps I should have done this first but it has been interesting
hearing all your comments and thoughts but I have just phoned the Solent CG.
I got a very strong recommendation that we report to them any vessel that should be
transmitting an AIS signal but which is not. It is the law that large or
passenger vessels or coded boats should transmit
 
Twister_Ken said:
Next, the captain's inside leg measurement.
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What you mean my old pal Nich' Bates?
Well, we're both getting on a bit now and due to that we've lost a bit in height.
But when we were last together in Sanantonio 3 years ago, he was still shorter than me and I reckon he's always suffered from 'ducks disease' so I would reckon his IL will be around 28-29. Inches of course.
:-)

"TWISTER KEN : Did "Ouzo" see it coming? I just like to use all possible
information to keep me out of trouble." ...............get out of that!!
 
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Scotty_Twister said:
The only Mary I've had on AIS recently was the Queen Mary as she slipped by Bembridge two weeks ago.
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She went astern of me as I returned from Holiday at the end of August, lights all ablaze

Scotty_Twister said:
Did that old Colvic make it across to the other side then? There didn't seem enough wind to move her old bones when you were due to go.
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Look at the Cherbourg 09 post on Scuttlebutt - get all the gorey details :D
 
LadyInBed said:
She went astern of me as I returned from Holiday at the end of August, lights all ablaze



Look at the Cherbourg 09 post on Scuttlebutt - get all the gorey details :D
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good on you, it seems you had a very satisfying little trip.
Better than my aborted one to the Chan' Isles. SW F6+ winds with chunky seas made me stay in Poole and The solent.
I reckoned that one of my crew would not be up to it as she had just got over swine flu. Just as well, she has gone down with post viral fatigue since, (whatever that is?) so I would never have forgiven myself had she been grog all the way there and back and I were seen to be at fault.
S
 
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