JRC JCY-1700 Instruction Manual page 64

Chapter6 Playback Operation
6.9.1.2 Rudder direction and heading block
This block shows heading against rudder direction by graphic.
The following figure is an example in case there is one rudder.
The green line shows rudder.
And the blue line shows heading by Gyro.
6.9.1.3 Heading block
This block shows heading graphically and numerically by Gyro.
Playback Software / Instruction Manual
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Rudder direction
Heading