I was wondering why compassmot hasn't been integrated into the rover code. I read the comment that says it's not needed but I've been testing a rover with some BIG motors drawing lots of amps and I can tell you that the compass reading can shift as much as 10 degrees. I'd have to stick the compass on a tall stalk to get far enough away from the EMI sources which isn't practical.
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So this guy(me) got a new external mag in the mail today. but I didn't order the freaking cable.
Im having this same issue. My g-made R1 crawler has the motor in the center of the frame. Im going to move my apm forward on a platform and see what happens.
I'm using the APM 2.5 with the internal compass. Im just getting into the rover. I took the apm off my tricopter because i never used the autopilot features. At first i though something was wrong with my compass after installing it on the R1. Then i realized that the apm was mounted very close to the brushed motor im using. So i built a platform and mounted the apm farther away. Which allowed me to get the compass calibrated. Button now i need to mount it out forward of the motor. Here are my first couple videos of it.
Jake, I'd definitely recommend converting that 2.5 to a 2.6 and using the external mag. It makes a huge difference on rovers, which are full of magnetic interference sources. Instructions on how to do that conversion are here (it's easy).
Ok i ordered the external mag. Thanks for the help.