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Old 15-06-2015, 15:05   #1
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AIS problem

We have a Raymarine C120 chartplotter with a Garmin 300 AIS receiver connected using NMEA 0183.

Everything has worked fine with all AIS tagets shown on the C120 untill today when some of the AIS targets showed up only periodically on the C120.

The target closest to us (500 feet) was shown on the C120 for a minute or so and then disappeared.

Any ideas on what is wrong or tips on a fault finding strategy ?

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Old 15-06-2015, 15:20   #2
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Re: AIS problem

Does your AIS share an antenna with the VHF? If so, can people 5 miles away hear you on VHF?

You could have a bad antenna/coax/connector, a bad splitter (if one is used) a bad NMEA connection or a bad AIS or chart plotter.

My bet is on the NMEA connection since those little wires are real buggers.


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Old 15-06-2015, 16:18   #3
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Re: AIS problem

They switched their AIS transponder off.
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