Good question. I do not know the answer, but I bet you it will start at 1 and just number them.I had all my waypoints on one of my units, and when I got the other unit installed and connected to the lss-1 all the waypoints off old unit, auto transferred to the new one.Its also nice to put a waypoint on one and the other auto accepts the waypoint for you.Will be interesting to see who may know the answer.Alright, Crappie Chatt.lol Whats the answer to this guys question? lol