VHF-DSC with or without AIS

[CarinaPDX]

Originally Posted by goboatingnow

I thought gps equipped ais did not export the gps position. I know ray marine updated the Ais650 to disable export of the internal gps

News to me, but I have an old (2008) AIS which exports GPS. Is it possibly a change with the updated SOTDMA spec? I don't see what the rationale would be but then again it is government...

Greg

[goboatingnow]

Originally Posted by CarinaPDX

News to me, but I have an old (2008) AIS which exports GPS. Is it possibly a change with the updated SOTDMA spec? I don't see what the rationale would be but then again it is government...



Greg

As I understand it class B ais must have its own gps and can’t share that data with external devices.

I know a raymarine firmware upgrade in 2013 disabled the gps output on the seatalkng

[CarinaPDX]

I am certain that having its own GPS is a requirement of the standard, but it doesn't make a lot of sense to not share it. But who said standards need to make sense?

Greg

[goboatingnow]

Originally Posted by CarinaPDX

I am certain that having its own GPS is a requirement of the standard, but it doesn't make a lot of sense to not share it. But who said standards need to make sense?

Greg

I think the requirements got changed around 2013.

[goboatingnow]

I would suggest that any AIS these days should be of the transponder variety. The real benefits only become apparent when ships can see your AIS beacon