Teletype WorldNav 5300, Руководство по оборудованию

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Main Menu
3.6 System
Volume
The GPS is set to the loudest volume setting for the
speaker. If you prefer not to hear the taps on the
screen you can tap the arrows to change the setting
to be turned off or made lower.
Factory Defaults are set to the loudest settings.
Hardware User Guide
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Backlight
It is recommended to always keep the GPS powered
by a charging cord, this will allow you to keep the
backlight setting to "Always ON", and keep the
brightest setting during the day, without worrying
about the battery drain. The WorldNav navigation
software can automatically dim the screen for night
driving. If however you would like to manually adjust
the brightness, use the backlight function.
Adjust the brightness to your liking and keep "Always ON".
Date and Time
Changing the date and time on the device will have
no effect on the information you see in the
navigation portion of the device as that information
is automatically taken from the GPS satellites after
you lock into position.