Oregon Scientific GP123 User Manual - Page 7

EN To calibrate the compass sensor: 1. Press DISP/- repeatedly to navigate to compass mode. 2. Press and hold SET. Display will show CALI and smart prompt . 3. Press SET to start calibration. 4. Rotate the unit clockwise at a constant speed. The moving segments around the circumference of the display act as a guide. The rotation will be finished once you have performed 2 turns. NOTE OK indicates calibration has been successfully completed. Repeat steps 2-4 if FAIL is displayed. NOTE If no key has been pressed in any 5 minute period, the compass will time out and return to Altimeter mode (default display). COMPASS SENSOR CALIBRATION NOTE DECLINATION ANGLE Declination is the angle between where a compass needle points (magnetic North Pole) and the true North Pole. The declination angle can vary from 0-30 degrees East (E) or West (W) and can be found on most maps or on the Internet. • Always take bearings in the open air, not inside buildings, tents, caves, or other shelters. • Compass readings should be performed away from magnetic materials. Avoid large magnetic objects, power lines, loudspeakers, electric motors etc. For declinations in the United States: http://www.ngdc.noaa.gov/geomagmodels/Declination.jsp 1. Enter your zip code in the text box. 2. Click "Get Location". IMPORTANT Compass calibration should be done on a flat 3. Scroll down and click "Compute". horizontal surface. If there is no flat stable surface available, place it on the palm of your hand so that it is perpendicular to For declinations in Canada: your body. Using the other hand, turn the unit to calibrate. http://geomag.nrcan.gc.ca/apps/mdcal-eng.php 7