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Old 04-05-2011, 21:51   #1
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OpenCPN AutoPilot Update Frequency

Is there an easy way of changing how fast data is sent to the Autopilot in OpenCPN? There are no settings for this. Some GPS now are capable of sending data multiple times a second. I would like the data sent to the Autopilot to be sent at the same rate (frequency) as data coming in from the GPS. Is this easily possible?

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Jason
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Old 12-05-2011, 03:56   #2
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Re: OpenCPN AutoPilot Update Frequency

From what I understood, NMEA0183 standards require to send data once per second
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Old 12-05-2011, 20:35   #3
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Re: OpenCPN AutoPilot Update Frequency

So I would probably have to change the source code and recompile to get the functionality I am looking for?
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Old 12-05-2011, 21:19   #4
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Re: OpenCPN AutoPilot Update Frequency

Jason....

How fast (per sec.) is your GPS receiver producing NMEA data?

Should be possible to add this feature,. I would like to understand your situation a little better.

Dave
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Old 13-05-2011, 05:00   #5
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Re: OpenCPN AutoPilot Update Frequency

Mine updates 5 times a sec... some update even faster. I am and Electrical Engineer and I am developing an autopilot as a hobby. I am trying to get away from using a compass (as most commercial autopilots do). A second is too slow of an update if I want to try using GPS data alone as my only input to my autopilot. This would most likely lead to bad oscillations at the rudder.

There are other ways around this. I could do the crosstrack error calculations in my microprocessor but I like the OpenCPN gui interface and it would start getting messy if I do it that way. I want it to do more than just follow a course. I want it to go from waypoint to waypoint.

I have done some research on entry level autopilots, but not alot. I would appreciate any suggestions on my approach.

I would really appreciate it if you would add this feature but since you would only be doing it for me I understand if you don't.

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Jason
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