Lowrance electronic Handheld Mapping GPS Receiver - Manual (Page 85)

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Map Menu, left, Map Categories Menu, right.
Map Orientation
By default, this receiver shows the map with north always at the top of
the screen. This is the way most maps and charts are printed on paper.
However, you can change the map orientation to Track Up or Course
Up if you switch to Advanced Mode.
Map orientation at left is shown in north up and at right, track up.
The default North Up setting is fine if you're always traveling due
north. What you see to your left corresponds to the left side of the map,
what you see to your right is shown on the right side of the map, and so
on. However, if you travel any other direction, the map doesn't line up
with your view of the world.
To correct this problem, a track-up mode rotates the map as you turn.
Thus, what you see on the left side of the screen should always be to
your left, and so on.
Another option is course-up mode, which keeps the map at the same
orientation as the initial bearing to the waypoint. When either the
track-up or course-up mode is on, an "N" shows on the map screen to
help you see which direction is north.
Which option you use is a matter of personal taste; we sometimes
switch back and forth depending on the circumstances. For example,
when we are in an area we know fairly well, we usually run the unit in
In Track Up mode, map shows "N" and arrow to indicate north.