I've spent a few flights trying out the "GPS Hold" feature on the Arducopter, and have some questions.
(This is the FahPah kit, with the MTK GPS and untouched RC2 software.)
The ship is rock-solid in Stable mode. No problems; like the most docile helicopter ever.
I make sure the MTK has a Solid-Blue-LED lock before liftoff.
When I engage the GPS Hold mode (via my Tx), I see the RED Led on the board illuminate. Then it gets weird.
The ship might start to descend quickly, or lift off, or translate to the side.
I can 'fight' it with the control sticks to hold it in the origin position, but it requires constant input. If I let go, it wants to dart off to the side.
Also, the altitude control is very lethargic. If the ship starts descending, I have to give almost full UP throttle to get it to stop descending, rebound, and avoid the earth.
I have never successfully had it hold in one position.. there is always a strong bias or unexpected behavior that needs intervention.
How are others doing with this? Could I have something connected wrong?
One other odd bit: The RED Arduino LED (GPS lock) does not track the Blue LED on the GPS directly. I have to engage GPS Hold mode to see the RED LED reflect the GPS status. Normal?