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Old 10-09-2016, 19:06   #1
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AIS Satellite vessel tracking

Both Marine Traffic AND Vesseltracker now offer AIS tracking by Satellite.

Available live on your PC, or as Android apps.
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Old 10-09-2016, 19:23   #2
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Re: AIS Satellite vessel tracking

Class B normally can't get up to the satellite. So it will mainly be Class A
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Old 10-09-2016, 23:54   #3
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Re: AIS Satellite vessel tracking

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Originally Posted by MarkJ View Post
Class B normally can't get up to the satellite. So it will mainly be Class A
My tests watching my folks boat tootle around tell a different story. I was getting a satellite update every few hours from their class B AIS. When they were well away from any shore based vhf AIS.

Big thread on it here
Satelite AIS.
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Old 11-09-2016, 01:29   #4
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Re: AIS Satellite vessel tracking

Excuse my ignorance here... but I take it these apps only receive AIS data while you are in range of cellular signal?
IE: Vessels transmit via satellite but you receive via cellular network? (Cant see how receiving information to mobile device is possible without network coverage)
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Old 11-09-2016, 01:44   #5
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Re: AIS Satellite vessel tracking

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Excuse my ignorance here... but I take it these apps only receive AIS data while you are in range of cellular signal?
IE: Vessels transmit via satellite but you receive via cellular network? (Cant see how receiving information to mobile device is possible without network coverage)
Correct in the vast majority of cases. You need some sort of internet connection and cellular is the way most cruisers get their internet.
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Old 11-09-2016, 03:56   #6
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Re: AIS Satellite vessel tracking

Class B can be tracked by SAT AIS very well. However you need a good aerial. Splitter is less likely to work.
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Old 11-09-2016, 05:04   #7
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Re: AIS Satellite vessel tracking

I was only picked up twice in 2 weeks last year
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Old 11-09-2016, 05:48   #8
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Re: AIS Satellite vessel tracking

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I was only picked up twice in 2 weeks last year
I suspect the explanation may be in the antenna.

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Old 11-09-2016, 05:54   #9
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Re: AIS Satellite vessel tracking

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I was only picked up twice in 2 weeks last year
Interesting... I wonder if the much higher traffic density up your way reduces the chance of a class B getting through to the satellite. Since the footprint is so large the normal AIS time slot allocations dont work, and its easy (in theory) for the weak class B signal to be swamped by the much stronger class A's.
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Old 11-09-2016, 09:46   #10
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Re: AIS Satellite vessel tracking

AIS is not a satellite-based system.
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Old 11-09-2016, 09:57   #11
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Re: AIS Satellite vessel tracking

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AIS is not a satellite-based system.
Correct. But, smart people figured out how to use satellites to receive AIS signals anyway, and send the data down to earth stations. Look at "ExactEarth" for one satellite AIS provider: exactEarth | AIS Vessel Tracking | Maritime Ship Monitoring
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Old 11-09-2016, 11:04   #12
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Re: AIS Satellite vessel tracking

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Originally Posted by Snowpetrel View Post
Interesting... I wonder if the much higher traffic density up your way reduces the chance of a class B getting through to the satellite. Since the footprint is so large the normal AIS time slot allocations dont work, and its easy (in theory) for the weak class B signal to be swamped by the much stronger class A's.
No, it was on passaged from St Martin to New York.
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Old 11-09-2016, 14:33   #13
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Re: AIS Satellite vessel tracking

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No, it was on passaged from St Martin to New York.
My guess is their is a huge amount of traffic in that area compared to the south pacific, where S-AIS seems pretty reliable. You are competing with every class A and class B in a 2000 km area around you for bandwidth. But that may not be the cause of your issue, just speculation on my part.

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Old 11-09-2016, 18:39   #14
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Re: AIS Satellite vessel tracking

Here´s a test of AIS Satellite targets in two busy ports, Ft. Lauderdale and New York. I used Vesseltracker on sailboats and yachts which I presume have AIS type ´ B `class transponders.


Tore
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Old 11-09-2016, 20:31   #15
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Re: AIS Satellite vessel tracking

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Originally Posted by sinbad8 View Post
Here´s a test of AIS Satellite targets in two busy ports, Ft. Lauderdale and New York. I used Vesseltracker on sailboats and yachts which I presume have AIS type ´ B `class transponders.


Tore
===

That is not necessarily a good test because Vesseltracker (like marinetraffic.com) also uses land based data capture stations, particularly in large harbors.

https://www.vesseltracker.com/en/static/Wishlist.html

It would be a better test if you could pick up class B transponders that were well offshore.
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