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85017_2.book Page 12 Monday, July 16, 2001 3:05 PM
12
Magnetic variation
Variation tells other equipment the level of magnetic variation
present at the boats current position. Local variation should be
entered using the appropriate keys. The settings available are:
•
Range = -30° to +30°
•
Default = Off
AutoAdapt
It may be noticed that the autopilot tends to be a little less stable on
northerly headings in higher latitudes of the northern hemisphere and
southerly headings in the southern hemisphere. This is caused by the
increasing angle of dip of the earth's magnetic field at higher
latitudes. This has the effect of amplifying the rudder gain on
northerly (southerly) headings, affecting all magnetic compasses and
getting worse the further away from the equator you are.
The RayPilot is able to compensate for this and provide precise
course keeping on all headings by automatically adjusting the gain of
the autopilot depending on the heading.
It is recommended that for high speed craft the Auto Adapt facility is
selected. This automatically reduces the effects of Northerly or
Southerly heading instability.
This feature is selected in calibration by entering the boat's operating
latitude. When selected it automatically adjusts the Rudder Gain
depending on heading removing the need for manual adjustment.
Note: If Auto Adapt is not selected manual adjustment of rudder gain
is normally required when going from Northerly to Southerly
headings or vice versa. Failure to do so can lead to poor course
keeping.
The settings available are as follows:
•
0 = Off
•
1 = North (default)
•
2 = South
RayPilot 650 Professional System
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