"I don't know if its really an error but the tracker didn't worked for me.

I use the code from that site: https://github.com/cgwood,
for ublox GPS, I uploaded the settings "3DR-Ublox.txt" with ucenter. you can get that from google.

for the ASM…"

"I found an Error:
change in tracker.ino for Elevation calculation:

_uavElev = toDeg(atan((uav.alt-(ASM.altitude/100))/_uavDist));

instead of

_uavElev = toDeg(atan((uav.alt-ASM.alt)/_uavDist));"

"I switched now to a uBlox Lea5. Works much better,
but I didn't know that a rotary switch is necessary. So I will add that soon.

Servos are working fine now, it just needs GPS, otherwise they are deactivated."

"ok tested outside. Servos work as soon as I have GPS Fix."

"hmm I tested the ASM with GPS reception.

when I connect with the drone, I was inside and both systems had no gps signal so far...
maybe I should test outside.
the only jumper I see is affecting the servo voltage. voltmeter shows 5.2 V
But both…"

"I am testing my new Ardustation Mega, using a Mediatek GPS. With the corrected code (#define GPS_PROTOCOL GPS_PROTOCOL_MTK19), it works fine.
Also Link with 3DR telemetry is fine. 

But I wonder if I need a rotary switch.
I really want to use the…"

"Hi Kim,
3s is still working fine. I used 2s and 3s for testing so far.
schematic doesn't give a hint... but I would not go over 15V for now"