Raymarine E Series User Reference Handbook page 74

2. Select Chart Setup.
3. Use the Chart Orientation menu item to select the Head-Up,
North-Up, or Course-Up option, as appropriate.
Chart motion mode
The motion mode controls the relationship between the chart and
your vessel.
Whilst motion mode is active, as your vessel moves, the chart is
redrawn to keep the vessel on-screen. The 3 motion modes are:
• Relative Motion.
• True Motion.
• Autorange.
Note: In the 3D chart view, the only available motion mode is
Relative Motion.
The current motion mode applies to all instances of the chart
application, including those running on networked displays.
When you pan the chart or select FIND CURSOR, the motion mode
is no longer active. This is indicated in the status bar by brackets
around the motion mode — for example, (RM). This enables you to
view another area of the chart whilst navigating. To reset the motion
mode and return your vessel to the screen, select FIND SHIP.
Manually changing the range in autorange also suspends motion
mode. The default setting is relative motion with zero offset. The
mode that you select is restored at power up.
Relative Motion with optional vessel offset
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When the motion mode is set to Relative, the position of your vessel
is fixed on the screen and the chart picture moves relative to your
vessel. You can use the MENU > Chart Setup > Vessel Offset
menu item to determine whether the vessel is fixed in the centre of
the window (0 offset) or offset by 1/3 or 2/3. If you change the offset
to 1/3 or 2/3, the view ahead of your vessel will be increased.
In the example shown above, the motion mode has been set to
Relative, with a vessel offset of 1/3. The vessel is fixed in the offset
position and the chart moves accordingly:
True Motion
When the motion mode is set to True, the chart is fixed and the
vessel moves in true perspective to fixed landmasses on the screen.
As the vessel's position approaches the edge of the screen, the
chart picture is automatically reset to reveal the area ahead of the
vessel.
Note: It is not possible to select True Motion when the orientation
is set to Head Up.
Autorange
Autorange selects and maintains the largest possible scale of chart
that will display both the vessel and the target waypoint. Autorange
is not available if radar-chart synchronization is on.
E-Series Widescreen User reference