Futaba GY501 - 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.
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.
Precautions When Turning on the Power Switch