Use Heading from Dual GPS

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Note that ardusimple is claiming a heading solution using 2 GPS receivers. They are claiming about 0.5 degrees heading accuracy at 1 meter spacing of antennas. https://www.ardusimple.com/simplertk2blite/ Their claims seem supported by this chart on page 5 of the uBlox ZED-FP9 data sheet here https://www.u-blox.com/sites/default/files/ZED-F9P_DataSheet_(UBX-17051259).pdf

I ordered one so will see how it goes. If I can eliminate my magnetic compass on my rover (and switch to a gps based heading) then I can get rid of the 4’ pole sticking out the top - whose sole purpose is to hold the compass up and away from the EM interference from other onboard electronics. (more discussion of that topic here )

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