Chart Orientation - Raymarine LIGHTHOUSE 4 Operation Instructions Manual

1. [Relative motion] — Relative motion is the default mode and keeps the
boat icon fixed on the screen whilst the chart is redrawn as your course
progresses. In relative motion mode the fixed vessel icon position can
be changed to provide more or less view ahead of your vessel. The
[Boat position] setting can be set to [Center] (A), [Partial offset] (B) or
[Full offset] (C).
2. [True motion] — True motion mode keeps the chart fixed and the vessel
icon will move across the screen, when the vessel icon reaches the edge
of the screen the chart is redrawn and the vessel icon will be moved to
the opposite side of the screen so that it can move across the redrawn
chart. True motion mode is not available when chart orientation is set
to [Head-up].
3. [Auto range] — Auto range maintains the largest chart scale that will
display both the vessel icon and destination/target waypoint.
Boat position in not available in [True motion] or [Auto range] modes..
The [Chart motion] and [Boat position] options are available from the [View &
Motion] settings menu: [Menu > Settings > View & Motion].

Chart orientation

The orientation setting determines how the chart is orientated in relation to
you vessel's direction of travel.
The following chart orientations are available:
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1. [North-up] — In North-up mode the chart is fixed with true north pointing
up. As your heading changes the vessel icon rotates accordingly.
North-up is the default chart orientation.
2. [Course-up] — In Course-up mode, when there is active navigation the
current destination waypoint points directly up. When the destination
waypoint changes the chart will rotate accordingly. The reference used
for Course-up depends upon the information available.
3. [Head-up] — In Head-up mode the vessel's heading always points directly
up. As your heading changes the chart rotates accordingly. In Head-up
mode if heading data is not available then stable COG is used instead.
If heading or COG is not available then Head-up mode is suspended
and the chart will orientate to display 0 degrees directly up if there is no
active navigation or Course-up if there is active navigation.
Note:
• To prevent constant rotations as the vessel yaws the chart will not
update unless the heading changes by at least 10 degrees from the
last displayed orientation.
• Head-up mode is not available when chart motion is set to [True
motion].
The [Chart orientation] setting is available from the [View & Motion] settings
menu: [Menu > Settings > View & Motion].