I recently had an episode where my drone would not arm. It was not able to obtain a GPS fix.
ArduCopter V3.2.1 (36b405fb)
PX4: ce602658 NuttX: 475b8c15
PX4v2 00360029 32334711 31363032
I suspect I accidentally changed some parameters. I compared all of my current parameters (from the wouldn't-arm episode) to parameters from my last successful flight data log.
I found discrepancies in a number of parameters and would like to investigate. I can't find any information on the following parameters - not on the full parameter list in Mission Planner, nor the APM copter wiki "full" parameters list here:
INS_GYR2OFFS_X, Y, & Z
INS_GYROFFS_X, Y, & Z
SR1_EXTRA1, 2, & 3
Any help or hints would be greatly appreciated. Any direction to a resource with complete parameter list, descriptions, and applicable range of settings would be fantastic :)