I keep randomly getting this false AIS
message. Sometimes 1/hr other times don't get it for hours. Its def not to do with speed as I have had it at anchor!
Background: my setup is a Vesper XB8000 and the chart plotter in the picture is a Raymarine
I note the message says Position Lost
which made me suspicious of the GPS
fix on the Vesper, so I went down the rabbit hole of connecting Vesper to my PC and:
(1) Checked connections to antenna
(external one) - all ok
(2) Check GPS
fix (HDOP is always below 2) - good fix
(3) Watched the GPS window until an error happened (there was no apparent loss of fix) - HDOP was still good.
(4) I also watched the status LED on the Vesper during an AIS
message - nothing unusual there.
So I am now getting suspicious of the Raymarine
- its GPS antenna
is also external and has a HDOP less that 1 with about 1 foot accuracy - so thats not the issue - but I wonder if there is something else triggering the message on the network?
There are no other AIS devices, but there is a second Axiom plotter, Autopilot
What next steps could I take to find this fault? I think there is a NMEA
logging function on the Raymarine Axiom - might try that.