I am a brand new user with a Garmin 60s. I have loaded 500 waypoints into Basecamp and created a route that is 170 miles long. When I upload the waypoints and route to my gps, I see all of the waypoints, but when I find the route, it says that it is only 90 miles long and the map overview shows it truncating at around the 260th waypoint. When I zoom in, I can see the waypoints all the way to 500. Any idea of what is going on?