Continual Monitoring And Adaptation; Compass Lock - Raymarine LIGHTHOUSE 4 Operation Instructions Manual

Item
Description
1 [Current reading:]
The current heading reported by the AR200.
2 [Maximum deviation at last calibration:]
The maximum deviation reported during the last linearization
process.
Important:
If the [Maximum deviation at last calibration] is 45° or
above, it is recommended that the AR200 unit is moved
and re-installed in a location which is subject to less
magnetic interference.
[Calibration in progress:]
While linearization is in progress the progress percentage is
displayed.
3 [Compass offset]
Once the linearization process has completed, it is possible
that the heading value may be slightly out of alignment. This is
common where installation space is limited and the AR200 is
not properly aligned with your vessel's longitudinal axis. In this
case, it is possible to manually adjust the Compass offset.
4

[Compass lock]

When enabled, the Compass lock prevents the continual
monitoring and adaptation of the compass linearization process.
For more information, refer to:
5 [Reset calibration]
You can reset your AR200's current linearization settings by
selecting [Reset calibration]

Continual monitoring and adaptation

To ensure optimum performance, after the initial linearization process is
complete the unit continues to monitor and adapt the compass linearization
to suit current conditions.
362
p.362 — Compass lock.
If the conditions for linearization are less than ideal, the automatic
linearization process temporarily pauses until conditions improve again. The
following conditions can cause the linearization process to temporarily pause:
• significant magnetic interference is present
• vessel speed too slow or too fast
• rate-of-turn too slow or too fast
Compass lock
Once you are satisfied with the compass accuracy, you can lock the setting
to prevent the system from completing a further automatic linearization in
the future.
This feature is particularly useful for vessels in environments that are exposed
to strong magnetic disturbances on a regular basis (such as offshore wind
farms or very busy rivers, for example). In these situations it may be desirable
to use the Compass lock feature to disable the continuous linearization
process, as the magnetic interference may build a heading error over time.
Note:
The compass lock may be released at any time, to allow the compass
continual monitoring and adaptation to re-commence. This is particularly
useful if planning a long voyage. The earth's magnetic field will change
significantly from one geographical location to another, and the compass
can continually compensate for the changes, ensuring you maintain
accurate heading data throughout the voyage.