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AIS/Marine Traffic #319801
05/18/2024 09:27 AM
05/18/2024 09:27 AM
Joined: Aug 2022
Posts: 13
P
Pyrat Pistol Offline OP
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Pyrat Pistol  Offline OP
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Joined: Aug 2022
Posts: 13
Marinetraffic.com (at least as linked from boatyball.com) shows indicators for boats all over the BVI. Some questions for those in the know:
1) do charter boats (e.g. the moorings fleet) have AIS beacons? If so, are they automatic or controlled manually?
2)  what's to explain the range of timeframes for boats shown? Some are from 18 hours ago, some are from minutes ago.

https://www.marinetraffic.com/en/ais/home/centerx:-64.550/centery:18.408/zoom:13

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Re: AIS/Marine Traffic [Re: Pyrat Pistol] #319802
05/18/2024 09:31 AM
05/18/2024 09:31 AM
Joined: Dec 2019
Posts: 178
18°44'42"N 64°24'09"W
D
duckfat Offline
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duckfat  Offline
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Joined: Dec 2019
Posts: 178
18°44'42"N 64°24'09"W
AFAIK, no (or very few) charter boats have AIS beacons.

The time difference is apparently the last time a beacon message was received from the vessel. I use marinetraffic.com to identify the ships that I see pass to the north of me here on Anegada.

Re: AIS/Marine Traffic [Re: Pyrat Pistol] #319804
05/18/2024 10:11 AM
05/18/2024 10:11 AM
Joined: Apr 2002
Posts: 7,109
GA/NC
GeorgeC1 Offline
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GeorgeC1  Offline
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Joined: Apr 2002
Posts: 7,109
GA/NC
All Moorings boats delivered in the last year should have ASI.

Re: AIS/Marine Traffic [Re: Pyrat Pistol] #319809
05/18/2024 10:39 AM
05/18/2024 10:39 AM
Joined: Mar 2008
Posts: 2,559
Grenada
Zanshin Offline
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Zanshin  Offline
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Joined: Mar 2008
Posts: 2,559
Grenada
The charter boats tend to have AIS, but often they haven't programmed in the boat name and they just broadcast a MMSI number.

The free version of marinetraffic uses volunteers for receivers placed all around the world. When a boat leaves the reception area of any receiver its last position is kept and the timeframe just gets older. Likewise, if an AIS is turned off then the last position just "ages". The paid version uses satellite receivers as well, and position reports are not limited to terrestrial stations any more.

Here's my last 24 hours of track (I'm anchored laugh ) : Zanshin Marinetraffic Track

Last edited by Zanshin; 05/18/2024 10:41 AM.

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Re: AIS/Marine Traffic [Re: Pyrat Pistol] #319821
05/18/2024 02:48 PM
05/18/2024 02:48 PM
Joined: Nov 2016
Posts: 137
Chesapeake Bay, USA
N
Nibj Offline
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Nibj  Offline
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Joined: Nov 2016
Posts: 137
Chesapeake Bay, USA
Do the Moorings boats have only receivers or do they have transceivers?

Re: AIS/Marine Traffic [Re: Pyrat Pistol] #319823
05/18/2024 03:04 PM
05/18/2024 03:04 PM
Joined: Mar 2008
Posts: 2,559
Grenada
Zanshin Offline
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Zanshin  Offline
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Joined: Mar 2008
Posts: 2,559
Grenada
I see moorings boat transmit. It is a good way for the charter companies to know where their boats are and where they've been. A transmitter is only insignificantly more than a receiver in the grand scheme of things.


[Linked Image]
Re: AIS/Marine Traffic [Re: Nibj] #319827
05/18/2024 03:17 PM
05/18/2024 03:17 PM
Joined: Apr 2002
Posts: 7,109
GA/NC
GeorgeC1 Offline
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GeorgeC1  Offline
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Joined: Apr 2002
Posts: 7,109
GA/NC
They have transceivers but again only on the recently delivered boats.

Re: AIS/Marine Traffic [Re: Pyrat Pistol] #319832
05/18/2024 05:10 PM
05/18/2024 05:10 PM
Joined: Aug 2013
Posts: 610
Jacksonville, FL, USA
onlymedication Offline
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onlymedication  Offline
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Joined: Aug 2013
Posts: 610
Jacksonville, FL, USA
I would estimate based on our recent charter that about 60%+ of the boats out there are transmitting an AIS signal. Still need to keep your eyes out, but it’s really becoming “easy button” sailing.


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