Raymarine E Series User Reference Handbook page 73

North Up (N-up)
In North Up mode, the chart orientation is fixed with true north
upwards. As your heading changes the vessel symbol moves
accordingly. This is the default mode for the chart application.
Head Up (H-up)
Head Up mode displays the chart with your vessel's current heading
upwards. As the heading changes the vessel symbol remains fixed
and the chart picture rotates accordingly.
Note: To prevent continuous backwards and forwards rotations
as the vessel yaws from side-to-side, the chart will not update
unless the heading changes by at least 10 degrees from the last
displayed orientation.
Using the chart
Note: It is not possible to select Head Up when the motion mode
is set to True.
Course Up (C-up)
In Course Up mode, the chart picture is stabilized and shown with
your current course upwards. As your vessel's heading changes,
the ship symbol moves accordingly. If you select a new course, the
picture will reset to display the new course upwards. The reference
used for Course-Up depends upon the information available at a
given time. The system always prioritizes this information in the
following order:
1. Bearing from origin to destination, i.e. intended course.
2. Locked heading from an Autopilot.
3. Bearing to waypoint.
4. Instantaneous heading.
If heading data becomes unavailable whilst in this mode, a warning
message will be shown and the chart uses 0° heading in relative
motion.
Setting the chart orientation
In the chart application:
1. Press the MENU button.
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