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Old 03-02-2017, 19:01   #1
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Mag Heading?

I have successfully installed OP. Added GPS and AIS. Now just added (and calibrated) the InvenSence MPU9250 IMU. Judging by the graphic it seems to be quite stable.

Rpi 3b
OP v8.0
GPS
AIS
MPU9250

My question is how do I get the Mag Heading to show on the vessel icon and the dashboard???
Thanks for any insight!
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Old 03-02-2017, 19:31   #2
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Re: Mag Heading?

Solosail...
First of all make sure to enable the WMM plugin. That will give you true heading and the vessel angle will be correct.
In Tools-options-ship set the prediction line, see:https://www.opencpn.org/wiki/dokuwik...ions_setting&s[]=heading#the_ships
There are more in Tools menu about heading. Read more in the wiki while there.

There are several instruments in Dashboard about heading, true and magn.
Of course all depends on correct NMEA sentences enter into OCPN
Håkan
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Old 03-02-2017, 20:58   #3
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Re: Mag Heading?

how do I get OP to enter NMEA sentences from I2C sensors?
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Old 04-02-2017, 01:32   #4
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Re: Mag Heading?

Solo...
In fact it's the opposite. OCPN is receiving serial string messages coded in NMEA 0183 format from any gadget. Your gadget has to send the heading in a appropriate NMEA 0183 format to OCPN.
There are many good examples out there how to use your compass board. Actually I did it once using the Arduino Uno but another similar circuit. Inexpensive heading sensor?
I think you can get your Rpi to talk Ic2 but that's another forum. Google will be your friend here I suppose.
Good luck
Håkan
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Old 04-02-2017, 05:07   #5
bcn
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Re: Mag Heading?

Solo..

you are using OpenPlotter, aren't you?
The people at the OpenPlotter forum can help you for sure to get the data from the IMU read. And fed into OCPN.
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Old 04-02-2017, 07:40   #6
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Re: Mag Heading?

Quote:
Originally Posted by solosail View Post
I have successfully installed OP. Added GPS and AIS. Now just added (and calibrated) the InvenSence MPU9250 IMU. Judging by the graphic it seems to be quite stable.

Rpi 3b
OP v8.0
GPS
AIS
MPU9250

My question is how do I get the Mag Heading to show on the vessel icon and the dashboard???
Thanks for any insight!
I have MPU9255. My free autopilot reads from this (and other) sensors and performs fusion and automatic calibration. The autopilot server has a simple client daemon that translates the signalk from the autopilot into nmea for opencpn.

This feeds opencpn with pitch and roll, and magnetic heading data, and receives autopilot route commands.

The autopilot also can receive nmea wind, and relay it to opencpn. The autopilot runs gpsd as well, so steering to compass/gps/wind, or fusion of these is possible.



It is also maybe possible to use openplotter if all you want is to display magnetic heading in opencpn from i2c sensors, but I don't think they have the automatic calibration I have, so the result would be worse.

Furthermore, you would never want the autopilot to read the data from openplotter instead of directly, as this would add latency in the gyro->rudder feedback loop.
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Old 04-02-2017, 07:42   #7
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Re: Mag Heading?

Solo...
I'm old fashion. Listen to bcn! OpenPlotter has the tools for you. Cool! https://www.gitbook.com/book/sailoog...tation/details
Håkan

Edit: Of course boat_a.......has it as well. (Posted simultaneous)
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Old 04-02-2017, 09:00   #8
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Re: Mag Heading?

Quote:
Originally Posted by bcn View Post
Solo..

you are using OpenPlotter, aren't you?
The people at the OpenPlotter forum can help you for sure to get the data from the IMU read. And fed into OCPN.
THANKS TO ALL!!!
Problem solved (with a reboot)
I didn't realise there was a separate forum for OP. Thanks!
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