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YS-S4 Multi-rotor Autopilot User Manual V1.4
SWITCH OFF the RC Transmitter whilst the autopilot is still powered on, the 'Flight Mode' should switch to display
"Return and Land", "Land" or "Auto hover" ( these options are the chosen F/S settings from your PC GCS ) the
throttle stick indicator should be in the middle and displayed in GREEN. If not, please setup the fail‐safe (F/S)
again.
7.
Adjustment Outdoors
7.1 GPS/Compass Calibration
When using the S4 V2 autopilot for the first time, the GPS/COMPASS must be calibrated before arming the
motors.
IMPORTANT:
（1）Compass calibration does not need to be done every time you fly but should be done when components are
moved or if the aircraft flies in unexpected ways, like in circles, for example.
(2) ALWAYS carry out this calibration outdoors, far away from metallic objects (cars, radio towers, power lines
etc.).
There are two ways to calibrate the compass: by Smartphone (with WI‐FI module) or by PC. There are 3 steps to
follow:
1. Level calibration
2. Vertical calibration
3. Save GPS/COMPASS data.
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