I'm hoping to try some loitering or position hold but get no GPS lock indicator on the "C" LED on the APM 2.0 when not plugged into the USB on my laptop.
If I connect the USB cable, even without MP open the GPS will lock, the "C" led will turn solid blue and all seems correct. When I unplug the USB both blue LED's stay lit for about 23 seconds and then the "C" LED goes out, no blinking though the GPS blue LED stays lit and I am in a mode (loiter) that requires GPS.
I tried arming the APM in position hold mode with the USB connected, still goes out 30 seconds from being unplugged from the USB. Tried resetting, reloading the firmware, caching a map, all to no avail.
What am I missing here?
I have the same issue like you and many others. My post is here,
I still have no reliable solution.