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How do I get a daily track distance log?
#4
Thanks for the replies! 

@Scarns So the plugins I've tried so far are Trip Logger, which only records a value of zero constantly, and two others SailCloud, and SailLogger which are cloud based, and so not much use in the middle of the ocean with no connectivity. 

It may be possible with some influxdb query in grafana, if there's some kind of track data, but deriving that information from GPS positions would clearly be too much for that.

 @PaddyB
I'd like to plot a rolling daily mileage based on GPS data, for the last 24 hours in grafana. OpenCPN is great, but as my pi 4 with 8Gb ram is already quite heavily loaded with multiplexing and data logging I run it headless and don't use it for openCPN. Thanks in any case for pointing that out, I didn't realise that the daily tracks also kept some averages! 

The reason I would find this information useful, is that for long passage it would help with planning, to know what is a reasonable expectation of daily progress for a given forecast. If you can say that this boat can usually do 140 miles a day mostly broad reaching, you can be pretty accurate about passage times. I find this is often more accurate than trying to be overly technical with polar charts and all the tweaking that requires.

I will try and find time to try and write a plugin myself, and so if anyone has any pointers on where to start I'd appreciate it. It seems like the track API that is used in freeboard would be a good place to start. Perhaps it would be better as as extension to the derived_data plugin.
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RE: How do I get a daily track distance log? - by barrymac - 2022-04-04, 02:21 PM

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