Hey, thanks for the explanations. The reason I started transfering tracks (after having made them from routes in basecamp !) was because whenever I tried to transfer a (say) 15 mile route to my etrex, it only accepted about half of the route.
The first time I did it was a route I had created on OS, which was up and around llanthony in Wales. When I looked on the screen of my etrex after the transfer, it stopped approximately half way round. In my naive way I thought maybe the etrex didn`t have enough memory to show it all with so many waypoints, having snapped the route in OS. I thought maybe when snapping it creates too many way points (being so accurately following the route in this national park).
So I started converting them to tracks which my etrex readily accepted on transfer & showed all of the track from start to finish..Another thing was that the routes showed a lolipop sort of emblem at every way point which actually obscured parts of the route just when I needed to see it clearly (at a waypoint/turning etc)