If you are returning to a WP that you maked on a previous trip and it is too far away to show up on your screen you can go to the menu settings for the GPS and call up waupoints and select "Go to" and the GPS will direct you to the WP. Also if you have "tracks" on you can retrace your track to the WP. Just play around with it and you will get the hang of it.
One thing I learned the hard way. Be sure to save your WPs to an SD card before you do any updates to the unit. I lost all mine by not doing this.
Mark 1:17 ...I will make you fishers of men