Rachel, I also have a SporTrak Pro, and really like it. Once you have several waypoints (caches) entered you can go to the Database Menu and edit the "Find By" to "Near Position" and it will list the caches by how far they are from your current position. After you have used SporTrak for a while, go back and take another look at the manual. It will all come into focus with a little practice and trial and error.
Have Fun!