I recently purchased a HB 859 DI unit. I have used the waypoint feature several times with no problems. I took the time and named all the waypoints I had saved at the house the other day. Next time out on the water I tried to save some new waypoints, and the screen says SAVED SUCCESSFUL - before it would say WAYPOINT 00??? SAVED. Then when I look for the waypoints in the menu there is nothing new showing up. What have I done wrong, I know I must have changed something in the settings??? Thanks in advance.