Garmin GPS III Plus Owner's Manual - Page 15
Initialize Position' and press ENTER. - map update
UPC - 753759015817
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Once the GPS III+ has calculated a position fix, you'll usually have anywhere from five to twelve satellites in view. The receiver will then continuously select the best satellites in view to update your position. If some of the satellites in view get blocked or "shaded," the receiver can simply use an alternate satellite to maintain the position fix. Although a GPS receiver needs four satellites to provide a three-dimensional (3D) fix, it can maintain a two-dimensional (2D) fix with only three satellites. A three-dimensional fix means the unit knows its latitude, longitude, and altitude, while a two-dimensional fix means the unit knows only its latitude and longitude. Initializing Your GPS III+ To initialize the GPS III+, take the receiver outside and find an open area where the antenna has a clear view of the sky. You may either hold the receiver at a comfortable height with the antenna pointing up (see page 4), or mount the receiver on the dash of a vehicle (Appendix A) or on a bike. (Likewise, when you use your GPS III+ in a vehicle, make sure the antenna is pointing up.) To turn the GPS III+ on, press and hold the red power key. The Welcome Page will be displayed while the unit conducts a self test. Once testing is complete, the Welcome Page will be replaced by a warning page, then by the Satellite Status Page. A message will inform you to "select initialization method". (If the initialization prompt has not automatically appeared, press MENU and highlight 'Initialize Position' and press ENTER.) To initialize your unit: 1. Press ENTER to acknowledge the message and see a list of initialization options. 2. Use the rocker keypad to highlight 'Use Map', and press ENTER. 3. Use the rocker keypad to point the map cursor to your approximate location (within 250 miles). You may also wish to use the IN and OUT zoom keys to make it easier to identify your approximate position. 4. Press ENTER to select the position and begin searching for satellites. GETTING STARTED Initialization Check the Satellite Status Page for '2D Navigation' or '3D Navigation' to verify a position fix. To initialize the GPS III+, designate your approximate location directly on the map display. Use the rocker keypad and IN/OUT zoom keys to position the cursor on the map. 5