The blue line (actually very close dots) is the trip. This is actually an 'electronic bread crumb trail' that the Quest saves as it is on and mobile. It's the same as the old story of dropping a stone or 'bread crumb' every few seconds behind you in case you get lost. This can be used to recover from being lost but I use it primarily as a logging feature for where I have been. Every dot contains information such as my speed, latitudinal/longitudinal location, direction, elevation, date, and time. I can use a software, GPS map explorer, to actually repdrive the trip if I wish. The data can be taken to many different programs to be manipulated. Kinda cool...
Some of you Garmin owners may wonder how I added the trip to a different map than Mapsource. I use a utility called GPS Map Explorer (found at http://home.tiscali.no/gpsii/). It will directly open the Garmin GDB file. Then I use Maps on Us (http://www.mapsonus.com) to zoom into the area that I so desire and save the map to a GIF file. Throw it into GPS Map Explorer and calibrate the two, the map and the Garmin track data. Pretty nice. If you want to view your tracks on a topo, color or BW satellite imagery, you might want to check out USAPhotoMaps (found at http://www.jdmcox.com/). It too is a very nice utility. I do not use it very often because my tracks are usually to widespread.
