I have been using my APM1 board for a while now with APM Planner as an ArduCopter 2 mode and am now trying to get it to work as ArduPlane.
I have downloaded the firmware with in APM Planner (1.1.77 mav 0.9) with Firmware->ArduPlane 2.33.
Seems to download ok.
I connect using USB in ArduPlane mode, everything seems ok except the HUD will not respond when I move the board about.
If I go to the CLI and type test->compass the readings the values displayed look good and respond.
If I switch back to ArduCopter2 firmware the HUD it works fine.