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Fastest 10 second average speed in knots Turning the S5 on for the first time 1. Open the waterproof case and turn on the S5 using the black plastic switch. Make sure that you are looking at the LCD display when you activate the switch.
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Operating Modes The S5 has two operating modes: speedometer mode and VMG mode. The decimal point after the second digit in the display is used to indicate which mode the device is in. For example the number 2.3 will be shown as “2 . 3” in speedometer mode and “2 .
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Tip for Windsurfers: Twist the S5 around your boom so that it faces your sail before you tack. You will then be able to read the display (now upside down) through your sail window on the new tack.
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In speedometer mode the accuracy of the S5 is better than +/- 0.2 knots (0.36 km/h). In VMG mode accuracy of the S5 depends on what angle to the wind you are sailing but is generally better than +/- 1 knot (normally closer to +/- .3 knots).