Lowrance GlobalMap 100 Installation And Operation Instructions Manual page 18

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. A course-up mode keeps the map at the same orientation
as the initial bearing to the waypoint.
In the north-up view shown below left, we're travelling southeast towards
camp, saved as waypoint number 14. In this view, the present position
indicator appears to move towards the lower right corner of the screen.
NORTH-UP TRACK-UP
COURSE-UP
In the track-up view, the present position moves straight towards the top
of the display. A "N" shows to help you see which direction is north when
the track-up mode is on. Remember, in the track-up mode, the screen
rotates as you change direction. It always keeps your direction of travel
(track) heading towards the top of the screen.
In the course-up mode, the screen is locked into your original bearing to
the recalled waypoint, regardless of your track.
To select the desired mode, first press the MENU key, select "MAP 1
SETUP", then select "MAP OPTIONS". Finally, select "ROTATE" and press
the right or left arrow key until the desired mode appears. Press the EXIT
key to erase this menu.
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