"So my and many others problem is with the wrong cable shipped wit the new APM 2.6 + GPS/Mag unit, 6 to 6 compering to the correct 6 to 5 pin cable.
3DRobotics is shipping new cable, let's see if this solves the problem."
"Hello Jack, I have exactly the same problem.
In my case they have send the APM 2.6 as ordered but the GPS cable was incorrect, apparently they have send bunch of them with 6 to 6 pins instead of 6 to 5. Even though the compass is connected and HUD…"