XAIRCRAFT FC1212-P - Manual (Page 25)

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IMPORTANT: There might be a brake before Position Hold entered in GPS ATT Mode; the brake depends on
moving speed of copter.
 if speed > 0.2m/s then there's a brake.

The brake stops if the brake-time more than 2 second.
 The brake stops when speed is lower than 0.2m/s.
 if speed < 0.2m/s then FC enter position hold directly.
In Flight Control interface, you can tune the GPS gain of position hold, or disable the position hold.
Height Hold
Height Hold function is enabled by default. Autopilot use an integrated barometer for Height Hold, the precision
of barometer is ±15CM in no wind condition. For improve suitability, we suggest tune height gain down to 20.
Return to Home (RtH)
Warning: Using Return to Home function, please ensure GPS has got enough satellites before the engines
start.
Configure the RtH function in AUX Input, can choose Input6, Input7 or Input8 for it. Do remember the position of
the RtH switch on your Transmitter.
You can configure the RtH Speed Gain to tune the speed of RtH. The default speed is fast, you can try 30 first.