This is information on what the LED's mean on the APM 2.0
Alternating RED & BLUE LED: APM Booting
Flashing BLUE LED: Acquiring GPS Fix
Steady BLUE LED: 3D GPS Fix Aquired
Flashing RED LED: APM Disarmed
Steady RED LED: APM Armed
YELLOW LED?
Steady GREEN LED: APM Power
Flashing ORANGE LED's: Data Transfer
How to arm the APM: Hold your throttle stick down and to the left for 5 seconds the red led should stop flashing and go steady. This important because every time you arm the APM it causes the barometer to be reinitialized (i.e. resets the current altitude to the home altitude).
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