A number of you had sensor calibration questions, so I asked Jordi, to get the answers straight from the source:
1) Are the sensors calibrated only when the bind plug is on or also with every reset?
Only when you insert the bind plug, then it will be recorded in the eeprom. If you restart you don't have to calibrate again (in short periods of 15 mins, battery change for example).
2) Does the sensor calibration happen after GPS lock or before?
The answer is after. The calibration happens exactly when you remove the bind plug, takes like 1 second.
3) What happens after you take off the bind plug? Any additional calibration?
Well, it will read the Z sensor for calibration and store all the values in the eeprom, which takes no time at all. Just be sure the airspeed sensor is not against the wind (in strong winds).
4) Should the airplane be held in the air while the sensor calibration is going on?
The airplane can be in the ground. Just stay away from the z sensor when removing the bind plug.
Any other calibration tips?
Always switch to autopilot when you are in ground, to see if the elevator and rudder responds. Remember that the Z sensor calibrates over time. If you leave the aircraft (even in manual) the sensor will calibrate better. Also try to apply pressure on the pitot tube to test the throttle vs airspeed.