Empathy List Archives

DL

Dave Legrow

Mon, May 18, 2009 9:20 AM

Another fellow who'd recently installed an AIS
didn't like his because he was constantly being contacted by other ships
inquiring as to his intended movements. Turns out he'd not only
entered his 64' boat as being 64 meters, but had reversed the length
and beam dimensions as well.

Yes, be sure to have your installer get the dimensions correct as well as the vessel type. I recently ran into (well not literally, we crossed two miles behind) a Nordhavn heading into Wilmington or there about, that was supposedly 6 meters long and 5 meters wide, and was designated as a fishing vessel.

Although I was too busy at the time to talk to them, a quick records check indicates that it was probably a Nordhavn 5509. Also if you tie you AIS to Coastal Explorer - it get s the dimension and antenna location information from the AIS, regardless of what you enter into CE. (This is correct to do 0 not a fault) So if the AIS is wrong, your CE display will be off as well, when you zoom in.

Dave Legrow

>Another fellow who'd recently installed an AIS >didn't like his because he was constantly being contacted by other ships >inquiring as to his intended movements. Turns out he'd not only > entered his 64' boat as being 64 meters, but had reversed the length > and beam dimensions as well. Yes, be sure to have your installer get the dimensions correct as well as the vessel type. I recently ran into (well not literally, we crossed two miles behind) a Nordhavn heading into Wilmington or there about, that was supposedly 6 meters long and 5 meters wide, and was designated as a fishing vessel. Although I was too busy at the time to talk to them, a quick records check indicates that it was probably a Nordhavn 5509. Also if you tie you AIS to Coastal Explorer - it get s the dimension and antenna location information from the AIS, regardless of what you enter into CE. (This is correct to do 0 not a fault) So if the AIS is wrong, your CE display will be off as well, when you zoom in. Dave Legrow

SH

Scott H.E. Welch

Mon, May 18, 2009 1:32 PM

dlegrow@yahoo.com writes:

Yes, be sure to have your installer get the dimensions correct as well as
the vessel type. I recently ran into (well not literally, we crossed two
miles behind) a Nordhavn heading into Wilmington or there about, that was
supposedly 6 meters long and 5 meters wide, and was designated as a fishing
vessel.

Yes, I have a similar story to share, except in this case the embarrassment
was mine: last summer I was cruising the Gulf Islands in BC, and spent a few
days near Thetis and Kuper islands. These are served by a small car ferry
(about 120 feet) from Chemainus. One day I happened to be watching the ferry
on AIS and I noticed that the transponder had clearly been installed
backwards. The arrow was pointing the wrong way, and the indicated speed was
9.5 knots in reverse.

I thought that I would be a helpful kind of guy, so I called the ferry
captain to let him know, and suggested that he let the maintenance guys
investigate.

You can imagine my mortification when he came back to remind me that he was
piloting a roll-on / roll-off car ferry, and that every return trip was in
"reverse".

D'oh!

Scott Welch
Product Manager, Open Text Collaboration and Social Media Group
www.opentext.com
905 762 6101

"Things turn out best for people who make the best of the way things turn
out." - John Wooden

dlegrow@yahoo.com writes: >Yes, be sure to have your installer get the dimensions correct as well as >the vessel type. I recently ran into (well not literally, we crossed two >miles behind) a Nordhavn heading into Wilmington or there about, that was >supposedly 6 meters long and 5 meters wide, and was designated as a fishing >vessel. Yes, I have a similar story to share, except in this case the embarrassment was mine: last summer I was cruising the Gulf Islands in BC, and spent a few days near Thetis and Kuper islands. These are served by a small car ferry (about 120 feet) from Chemainus. One day I happened to be watching the ferry on AIS and I noticed that the transponder had clearly been installed backwards. The arrow was pointing the wrong way, and the indicated speed was 9.5 knots in reverse. I thought that I would be a helpful kind of guy, so I called the ferry captain to let him know, and suggested that he let the maintenance guys investigate. You can imagine my mortification when he came back to remind me that he was piloting a roll-on / roll-off car ferry, and that every return trip was in "reverse". D'oh! Scott Welch Product Manager, Open Text Collaboration and Social Media Group www.opentext.com 905 762 6101 "Things turn out best for people who make the best of the way things turn out." - John Wooden

TL

Troy Leek

Mon, May 18, 2009 1:49 PM

I have seen the ferry in Galveston quite a few times on AIS and the AIS data
was not going backwards, seems to me that not having the correct data would
defeat the purpose of AIS.

You can imagine my mortification when he came back to remind me that he was
piloting a roll-on / roll-off car ferry, and that every return trip was in
"reverse".

Hotmail. has a new way to see what's up with your friends.
http://windowslive.com/Tutorial/Hotmail/WhatsNew?ocid=TXT_TAGLM_WL_HM_Tutoria
l_WhatsNew1_052009

I have seen the ferry in Galveston quite a few times on AIS and the AIS data was not going backwards, seems to me that not having the correct data would defeat the purpose of AIS. > > You can imagine my mortification when he came back to remind me that he was > piloting a roll-on / roll-off car ferry, and that every return trip was in > "reverse". > _________________________________________________________________ Hotmail. has a new way to see what's up with your friends. http://windowslive.com/Tutorial/Hotmail/WhatsNew?ocid=TXT_TAGLM_WL_HM_Tutoria l_WhatsNew1_052009

PB

Peter Bennett

Mon, May 18, 2009 7:37 PM

Monday, May 18, 2009, 6:49:47 AM, Troy wrote:

TL> I have seen the ferry in Galveston quite a few times on AIS and the AIS data
TL> was not going backwards, seems to me that not having the correct data would
TL> defeat the purpose of AIS.

You can imagine my mortification when he came back to remind me that he was
piloting a roll-on / roll-off car ferry, and that every return trip was in
"reverse".

It appears that most of the double-ended BC ferries have a "which way
is front" switch, so, if the skipper remembers to change the switch,
their heading does match the direction of travel. The ferry Scott
mentioned seems to be an exception. However, some other ferries show
length and beam as zero.

--
Peter Bennett, VE7CEI Vancouver, B.C., Canada
Ennos 31 "Honeycomb"
GPS and NMEA info: http://vancouver-webpages.com/peter
Vancouver Power Squadron: http://vancouver.powersquadron.ca

Monday, May 18, 2009, 6:49:47 AM, Troy wrote: TL> I have seen the ferry in Galveston quite a few times on AIS and the AIS data TL> was not going backwards, seems to me that not having the correct data would TL> defeat the purpose of AIS. >> >> You can imagine my mortification when he came back to remind me that he was >> piloting a roll-on / roll-off car ferry, and that every return trip was in >> "reverse". >> It appears that most of the double-ended BC ferries have a "which way is front" switch, so, if the skipper remembers to change the switch, their heading does match the direction of travel. The ferry Scott mentioned seems to be an exception. However, some other ferries show length and beam as zero. -- Peter Bennett, VE7CEI Vancouver, B.C., Canada Ennos 31 "Honeycomb" GPS and NMEA info: http://vancouver-webpages.com/peter Vancouver Power Squadron: http://vancouver.powersquadron.ca

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AIS - Vessel Info