I recentlly downloaded the eastern portion of the Trans America Trail into my Garmin Zumo 665 from the hard copy maps I bought and utilizing the Mapsource software. Everything was fine (not counting the variances from the maps and the roll charts) except that in Mississippi half of the via points, and thus that portion of the route disappeared. When I got home I looked at the route on my laptop and all the via points were still there. The route in question was 302 miles long with 391 via points. What happened when I transferred the route from my laptop to the GPS? Is there a limit to the number of via points or the route miles a GPS will accept? The waypoints were all still there so going from waypoint to waypoint reconstructed the route Just wondering what happened to the via points.