Magellan eXplorist 300 Manual - English - Page 72
Restarting the GPS
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Preferences 66 Restarting the GPS Restarting the GPS provides a means of giving the eXplorist information about its approximate position. Longtime GPS receiver users will know this option as initializing. To understand when you would use this option, a brief explanation of how the eXplorist works will be helpful. The GPS constellation consists of 24 satellites and three spares that orbit the earth. At any given time of the day a different collection of satellites will be overhead. To keep track of which satellites are in view, the eXplorist has a built-in almanac that uses the present date and time, along with its approximate position, to "look-up" which satellites should be in view. Every time you turn your eXplorist off, it records, in a special place in its memory, the last position fix computed Then, when it is turned back on, it assumes that it is still in the same approximate location and uses this last position fix when doing its "look up" in the almanac. Now, if you turn your eXplorist off and fly across the country, the next time you turn it back on it will think it is still at the location where it was turned off and will begin looking for the satellites that it thinks are overhead. If the satellites are not there, the eXplorist begins "polling" the skies, trying to determine which satellites are in view. This process can take time and can appear as if the GPS portion of the eXplorist is not working. Under normal conditions, the eXplorist will still be able to compute your position, but this can take longer than normal. Restart GPS gives you the ability to give the eXplorist its approximate location, hence speeding up the time to acquire its first fix. Many eXplorist users will never need to use the Restart GPS option, but it is available should the need arise. When to use Restart GPS: • When the eXplorist has been moved more than 500 miles (804.67 km) while turned off. • When the eXplorist is sluggish and takes more then a few minutes to compute its first position fix when turned on. (This really isn't an option that you need to be concerned about. Thanks to a built-in feature, the eXplorist, when it has trouble computing its first position fix, automatically asks you to supply the approximate position.) Restarting the GPS: 1. Press MENU. 2. Use the Arrow joystick to highlight Preferences. 3. Press ENTER. 4. Use the Arrow joystick to highlight Restart GPS. 5. Press ENTER. Preferences Restart GPS Map Units Pwr Management Personalize Language Clear Memory