It helps a lot to rename the waypoint to something you can remember.
my waypoints get renamed,The first couple letters are usually the same as the first couple in the name of the lake. that way they sort themselves by lake. then i add more letters that mean something to me. for instance." RP " if it is a rock pile, "RB" for road bed. what ever works for you.
to get back to the waypoint you just click menu>menu>Nav>waypoints>GO to>select the waypoint you want to go to. that will create a track you can follow to the waypoint. if you are on a chart screen. a mini menu comes up on the fist click. then just click> waypoint> goto>select the waypoint you want to go to.