The direction display LEDs will indicate progressively decreasing wind angle as the direction offset calibration process proceeds, then display 0 degrees. The speed display LEDs will indicate progressively decreasing wind speed as the speed coefficient calibration process proceeds, then display 0 knots. Wait a second or two. Release the pushbutton. Depower the anemometer.
Calibration is complete.
Repower the anemometer and confirm that the direction indicated is north and the speed indicated is the Calibration Speed. Do a U-turn and again check that the direction indicated is north and the speed indicated is the Calibration Speed. If not then the day may be too windy to calibrate the anemometer accurately. Setting only direction offset If you remove either the cup and spider assembly or the chopper disk from the shaft and do not replace them with exactly the same relative orientation then you need to reset the direction offset. Have a helper drive the car at a convenient speed.