You first input the coordinates on your DF and name it whatever you deem appropriate, like MacksBP for Mack's brush pile. Once it is stored on you DF you select "go to" in the navigation menu and it brings up all the waypoints you've saved. You cursor down to the one you want and select it.
The DF will set up a path for you to follow. Keep in mine it will be a straight line so you may have to maneuver around islands, trees, etc. but it will take you right to your waypoint.
Mark 1:17 ...I will make you fishers of men