"Vincent -You could always go into the CLI and reset the apm before you load the new firmware. That will erase waypoints.
+1 on the sonar issue: XLEZ0. Tried grass and concrete. Reads .2 - .31 then nothing until 10m."
"I have the same problem with the apm2 running arduplane firmware. To get past it I power the apm2 with a laptop before plugging in the battery of the plane. I haven't been able to find an answer to the problem, but I have been able to boil it down…"
"Took a while to get here, because the kit comes from Tel Aviv, but it works great on my Turnigy 9x with er9x firmware. Well worth the wait. Great improvement over the standard pot. The solid clicks are reassuring. The only thing i modified on it…"