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Old 17-09-2016, 20:04   #1
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Does OpenCPN have an AIS cache for vessel names?

Not sure I have an appropriate title, but the best I can think of.

I'm troubleshooting my new Raymarine system, specifically a new eS98 MFD and our existing Raymarine AIS250.

It seems to me that the eS98 is not populating names of vessels in an appropriate time -- just showing the MMSI number. No destination or other information either.

I first noticed this on an early sail with the new MFD when I spotted a large vessel approaching the Golden Gate Bridge. I wanted to know it's destination to see if we might be in it's likely path. I checked the AIS info and only saw the MMSI number for the vessel. No destination information at all, no vessel name.

Today, in the safety of our marina, I had both the Raymarine and OpenCPN systems fed from the AIS250. The OpenCPN quickly displayed a vessel's name while it did not show up on the Raymarine.

I think it's possible that a vessels name might not be transmitted for up to (perhaps) six minutes due to the design of the AIS system. After writing a long post on the Raymarine forum I started to wonder if OpenCPN might "cache" names from previous trips. I generally do run OpenCPN down below at the navigation table.

Just trying to "rule out" possibilities.

Thanks,
Robert
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Old 17-09-2016, 20:46   #2
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Re: Does OpenCPN have an AIS cache for vessel names?

Robert...

OpenCPN does cache vessel names against MMSI number. The cache file is called "MMSINAME.CSV", and is found in your OpenCPN config file directory.

Dave
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Old 17-09-2016, 22:40   #3
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Re: Does OpenCPN have an AIS cache for vessel names?

Thanks for directing me to the cache file. Looks as if i may be dealing with the simple realities of AIS.

Robert
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Old 17-09-2016, 23:27   #4
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Re: Does OpenCPN have an AIS cache for vessel names?

Remember that you can distinguish AIS target names from the cache from the rest by the color.

light green: no static data received in this run
green: static data actual
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