FUTABA GY501 Instruction Manual page 21

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Initialization
When the power switch is turned on, the GY501 automatically
obtains the reference signal for AVCS function correction and
initializes itself.
Precautions When Turning on the Power Switch
During initialization, the message **INIT* appears on the GY501
LCD screen.
Do not move the helicopter until this message disappears (in
about 5 seconds).
Also, do not move the transmitter rudder stick from the neutral
position during this period.