Lowrance electronic GlobalMap 4800M - Manual (Page 102)

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System Setup Menu, left, Units of Measure Menu, right.
To set Speed/Distance Unit of Measure: Press
↑ or ↓ to change the
Speed/Distance, then press ENT . After the option is set, press
EXIT | EXIT | EXIT to return to the page display.
To set Heading: Press
↑ or ↓ to change the heading type, then press
ENT . After the option is set, press EXIT | EXIT | EXIT to return to the page
display.