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Magnetic Declination
When set to the local declination, the COG will be referenced to local magnetic north. Positive
declination represents east and negative declination represents west. To reference the COG
measurement to true north, use 0 for compass declination. Default magnetic declination is 0 degrees.
When using a magnetic compass in conjunction with the ProStart, setting the magnetic declination to the
local declination can be useful since both instruments will be referenced to magnetic north.
NOTE -
It is important to enter your local magnetic declination for the Line Square To feature to work
with your magnetic compass.
Three resources for finding your Local Magnetic Declination:
Enter
http://www.magnetic-declination.com/
Enter
https://www.ngdc.noaa.gov/geomag/calculators/magcalc.shtml
Search "magnetic declination calculator" in the search engine of your choice
Bow Offset
Setting the bow offset is optional.
Bow offset is the distance in meters from where the ProStart is mounted to the bow of your boat. In
start mode the offset is used to calculate the distance between the tip of your bow and the start line.
The default is 0 meters.
For more information on setting the line with and without the bow offset see Understanding Distance to
Start Line section on page 25.
Heading / COG
You can select magnetic heading (compass) or COG (GPS direction you are moving) for your direction
output. This information is displayed on the top line of data in Race Mode.
When magnetic heading is selected, your heading will be displayed in three digits at all times. When COG
is selected, your course will be displayed without leading zeros.
Compass Damping
The damping rate affects the response of the ProStart to a change in heading. The greater the damping
value the smoother the heading change will be, but the slower the response will be to a change in
heading.
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