?AIS failure

[deep denial]

keen to try out my new ais setup the other day in Poole harbour - nasa ais connected to garmin small chartplotter. A few targets showed up, being the moored ships opposite the quay. But then the Barfleur channel ferry sailed past, with nowt showing on the screen. Is it more likely that
a) the ship was not transmitting an AIS signal, or
b) my set was malfunctioning selectively?
with hindsight of course I should have called him up to ask, but didn't

 

[alan17]

At the time that the ferry went past were the other targets still showing?
If answer is "yes" then a malfunction of your AIS seems unlikely.

 

[doug748]

I have been having a fiddle with a similar set up. A large ferry leaving port was invisible and then suddenly appeared on the Nasa. I assume someone sorted the kit out as it left the harbour.

 

[CPD]

I know of a pilot at Harwich who tells me its not uncommon for vessels to set off having forgotten to switch on AIS, or even having arrived from overseas with it still off. Radar v AIS ??? mmmmmmmmm

 

[wooslehunter]

SOLAS makes it mandatory that all ships above 200 tonnes & all passanger carrying ships carry AIS. Does it state it has to be switched on though. AND, if it does, does it make any requirements on the accuracy of the info.

 

[chuzzlewit]

I had same experience with Barfleur in Poole Bay, but AIS later picked up moored boats perfectly. I told CHIRP about it and they checked with Poole harbour master who said there was no problem.I changed the AIS aerial and cable and felt rather silly.

 

[wotayottie]

[ QUOTE ]

with hindsight of course I should have called him up to ask, but didn't

[/ QUOTE ]

no you shouldnt - the guys driving that boat have an important job to do and should not be interrupted by yotties asking about trivia. sorry if this sounds pious or unfriendly - it isnt meant to be. but if you think about it ................ /forums/images/graemlins/grin.gif