Getting very unhappy with the APM 2.6.
I think the software is not what you show above. My Test does not have half the lines you show.
I know the problem from my experience with other Arduino products (I use Mega 2560 R3 to build dome controllers for astronomy)
However...The APM is not designed as well as the R3. Power problems all over the place!
3.3V regulator issues cause most likely by Power loops.
My power loop was because I was powering the APM via the RX servo leads. (Why not?)
I then plugged the USB lead in and fried the two chip components next to the USB port.
This in turn took out a track that provided the 3.3v to the MP6000 and Baro.
Very little information on the 2.6 board layout and due to surface mount almost impossible to repair.
I am still trying to find a track (in my spare time) that I can insert external 3.3V from the regulator on the board.
All the terminal functions work. But as I said, I don't know where you got your software, not the same as mine. Mine is Mission Planner 1.2.96.
While I am typing... Bought a GPS UBLOX NEO 6M that said APM 2.6 compatible. But it has all the wrong connectors? Just has 4 single connector wires red black yellow and green. Just spent the last hour trying to find out what all the pins are on the 2.6 - No luck yet. The group of 6 pins next to the GPS writing must be the ones but which is which?
Now need to find a compass!!!!
I notice that UnmannedTech and xxRobotics?? Neither have information on 2.6 pinout..
I notice RCModelReviews is going to look at the APM - should make interesting reading.