I think the waypoint limit is applied to saved or installed waypoints. If setup as part of a map, the campsites, portages and routes, are installed as map items and do not affect total waypoint limits. When I had a 62st I had many maps that displayed camps, routes, portages, and such that could be viewed as layers on the display.
This screenshot shows PaddleNav, MNTopo, BWCA camps and portages, 100k Garmin Topo, all displayed at one time.
butthead