IS15 Wind Manual
10
20220752H
Screen 4
True Wind Angle and VMG
This display is indicated by the left LCD arrow being lit,
showing 'True' (Wind Angle). Otherwise similar to the Apparent
Wind Angle and VMG display.
Screen 5
True Wind Angle and Wind Direction
This display is indicated by the left LCD arrow being lit,
showing 'True' (Wind Angle), with the LCD showing the wind
direction in degrees.
Notes !
1.
The Wind Direction is calculated from available heading data. The
wind direction given is the effective wind direction over the water.
The display will be most accurate after a period on one heading,
however, it will respond rapidly to course changes.
2.
If there is no heading data, but Course Over Ground (COG) data
is available then the Wind Direction is calculated from the Course
Over Ground. In this case there is compensation for the tide, and
the wind direction given is the effective wind direction over the
ground. However the display will not be accurate after a course
change, and will require a period on one heading before it is
correct. (Any errors in the Navigation Receiver’s fix will degrade
the accuracy of the wind direction.)
3.
The Wind Direction is referenced to either Magnetic or True
North as selected for the heading. The data can be converted from
one to the other if the local magnetic variation is available.
Sub screens
All main LCD screens have the same three sub screens to set the
following: Display damping, (true) Wind Speed Alarm On/Off
and (true) Wind Speed Alarm Limit.
Press and hold the
button for 2 seconds to access the sub-
screens. Use short presses on the
button to select one of the
sub screens.
Display Damping (d1-d4)
Both the wind angle and the wind speed are controlled by the
same damping function. There are four damping levels.
On power up damping level 1 is always selected.
