Specifications

IS15 Wind Manual
10 20220752J
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.