Unlike most descriptions that I can find, my GPS unit only has ONE cable coming from the GPS unit. I can't get the compass to calibrate in Mission Planner. All the points are clumped around a single spot far out in the periphery of the live calibration screen.
1. Does my GPS unit even have a compass?
if so, how do I connect the darn thing to my China copy pixhawk 2.4.8!
I've tried taking the 4th and 5th wires from the GPS and plugged them in to the I2C pins 2 and 3,
Thank you for reading this, and I appreciate the help.
Here's what I have gleaned so far in researching this further.
1. the APM 2.5 has a built in compass
2. evidently the apm 2.6 does not have a built in compass. (http://ardupilot.org/copter/docs/common-compass-setup-advanced.html)
hence there wasn't a need for an external compass when using the APM 2.5. I must conclude that mine does not have an external compass, merely GPS.
Hope this helps prevent a lot of frustration if you have a similar configuration.