Magellan SporTrak User Manual - Page 62

How often do I need to initialize the SporTrak? Initializing the SporTrak decreases the time it takes to get a position fix during cold start. What is meant by a cold start is that the SporTrak has no reference to use as a guide to tell it what satellites should be overhead. Without a reference to start with, the SporTrak will have to "search the sky" trying to find any satellite that may be in "view." This takes time and can increase the time it takes to get its first position fix. (Can take 10 minutes in severe conditions.) So where does this reference come from? Under normal operating conditions, the last position fix computed before the SporTrak was turned off is stored into memory and will be used as the reference the next time the SporTrak is turned on. However, if you cleared the memory (see Clearing Memory - All in the Reference Chapter) this stored reference point is removed from memory and you probably will want to initialize the receiver again. Also, if you travel with your SporTrak for more than 500 miles with it turned off, it will still have the reference point but it may be too inaccurate to be useful and again, you may want to initialize the SporTrak. Navigation Screens Why does my compass not point in the right direction? The SporTrak computes direction by comparing your present position to the last position taken, it requires that you be moving to compute your compass heading. Furthermore, to eliminate error, you must be moving at a minimum of 0.5 mph. Routes What is a backtrack route? A backtrack route allows you to "retrace" your steps. As you are moving, the SporTrak automatically creates and stores hidden waypoints into memory. These waypoints are the ones that the SporTrak will use to retrace your steps. When you create a backtrack route, the SporTrak converts these hidden waypoints into User Waypoints. 54 Magellan SporTrak