Holux Portable Automobile Navigation System - Manual (Page 26)

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The included memory card contains the digital map files that are
required for the GPS navigational data. Please do not delete.
When removing the memory card, please make sure the card is not
reading data, or it will cause a system crash.
Please do not set the SD memory card as write protect, or the
system cannot be successfully executed.
When operating, accidental removal of the memory card will result
in showing an error message, please reinsert the memory card and
the system may need to be reset before successful execution.
Function Menu
The function menu is the main function window other than the
navigation screen and includes system settings, navigation settings,
schedule plans, GPS status, MP3, image browsing.
Entering the Operation Menu
Under the navigation screen, press the Menu key to enter the
operational menu.
For other detailed operational explanations, please refer to the
navigational software manual.