Lowrance electronic 540c Baja - Manual (Page 33)

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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.
Now that you have your GlobalMap 540c 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.