Garmin eTrex Summit HC Owner's Manual - Page 32

Main Pages Using the Electronic Compass (All of the eTrex HC series units use a GPS data driven compass but only the Vista HCx and Summit HC have an additional electronic compass.) When you press and hold QUIT on these units, the electronic compass turns off and stays off until you press and hold QUIT again. The electronic compass functions like a magnetic compass when you are stationary. When you are moving and reach a pre-set speed, it uses data from the GPS receiver to maintain your heading. When you stop (after a pre-set time), it again operates like a magnetic compass. To turn the electronic compass on or off: 1. Press and hold Quit to turn the electronic compass on or off. The compass icon appears in the status bar when the electronic compass is on. When you are not using the electronic compass, turn it off to conserve batteries. When it is turned off, the unit uses the GPS receiver for navigation. 2. Hold the Vista HCx level to get an accurate electronic compass reading. Setting the speed and time for Compass Auto On and Off: 1. Press Menu twice > Setup. 2. Select Heading. 3. Select Switch to compass heading when below.... 4. Use the numeric keypad to enter a speed. 5. Select for more than... to set the time delay from the time options list. Calibrating the Electronic Compass Calibrate the electronic compass outdoors when you first use the Vista HCx or Summit HC. To ensure continued accuracy, calibrate after installing new batteries, after moving more than 100 miles (160 km), or experiencing a temperature change greater than 68º F (20º C) from the last calibration. The accuracy of the electronic compass is also adversely affected if the unit is not held level or you are near objects that affect magnetic fields, such as cars or buildings. 28 eTrex HC series Owner's Manual