Lowrance electronic GlobalMap 4800M - Manual (Page 28)

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MapCreate™ 6 CD-ROM, left; MMC card reader for USB ports, right.
Now that you have your GlobalMap 4800 installed, move on to Section
3, Basic GPS Operations. There, we'll present a series of step-by-step
tutorials to teach you the basics of GPS navigation.
Face Cover
Your unit comes with a white protective cover that snaps on and off the
front of the unit. This cover is intended for use when your unit and the
vehicle it's mounted in are idle.
WARNING:
When the unit is mounted in an unprotected area, such
as an open boat cockpit, the protective face cover must
be removed when the vehicle is moving at high speed.
This includes towing a boat on a trailer at highway
speeds. Otherwise, wind blast can pop off the cover.