Japan Radio Co. JLN-740A, Instruction Manual

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Adjust the brightness of the display according to the surrounding lighting
conditions.
In NWZ-510SDW, the using of [NIGHT] may interfere with the recognition of
display information.
In NWZ-4640, the using of [DARK] may interfere with the recognition of
display information.
Do not carry out operation of touch panel by a sharp object.
Otherwise, the screen may be damaged.
If power outage occurs inside of the ship during the operation of the Doppler
log, the image may be disturbed or may not be displayed.
In this case, reconnect the power supply.
Do not turn on the power for the equipment while the ship is out of the water
(grounded).
Otherwise, the transducer mounting may be damaged.