Leisure-Trekking-orientation
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The COMPASS gives the orientation and direction to walk from the magnetic pole and the map. The The GPS(Global Positioning System) gives you all the basic navigational features you'll need to get you anywhere you want to go, and back again, time after time. The ALTIMETER measures the altitude in respect of the atmospheric pressure. The VARIOMETER measures the difference of altitude for the windgliders. The COMBINED INSTRUMENTS , with watch,compass,altimeter,barometer etc..
