anywhere; on the beach, in the parking lot or on the water. The only thing that matters is
that the one point is at least 75m directly upwind of the other.
It is possible to set the reference points in the opposite order, i.e. upwind first, then
downwind. Also, the reference points can be reset independently. That is to say you could
change the upwind reference point while keeping the same downwind point.
Reference points are stored in non-volatile memory so they are not lost when the device is
switched off. If you often sail somewhere where there is a consistent seabreeze you don’t
need to program in a new wind direction every time you train with the S10.
After you have stored the locations of the two reference points, the S10 will indicate both
your upwind and downwind VMG in real time. This will always be a positive number. When
you are pointing higher than a beam reach this will be your VMG upwind, if you are sailing
lower than a beam reach it will be your VMG downwind. If you sail on a beam reach the
device will display a very small number no matter how fast you are going.
Logging GPS Data
Whenever the S10 is turned on and has a GPS solution (i.e. when the display is showing
speed or VMG and not flashing “00”) it will record the following data in its built in flash
memory at two second intervals:
•Latitude in degrees
•Longitude in degrees
•Time (GMT)
•Speed in knots
•Heading in degrees true
The data logging happens automatically. The S10 has enough memory space to hold over
10 hours worth of GPS data. Once the memory is full, the device stops recording new
information.
The only way to remove data from the device’s memory is to follow the procedure
described under
Clearing GPS Data from Flash Memor
ybelow. Removing the device’s
batteries for any length of time will not erase the memory.
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