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You sure? I thought I'd used tracks before that did turn by turn on the etrex? It's been so long I've probably forgotten how I set it up. Maybe I converted a track to a route first.
Might be confusing it with my old HCx which could do a TracBack...
http://forums.gpsreview.net/discussion/29845/follow-track-on-an-etrex-30x-vs-good-old-vista-hcxNah, you can on the newer ones too..
"If you do a Where to, tracks you can select saved tracks and in track manager you can pull up saved tracks and also navigate with them. "
Depends if you want turn arrows or not. You get them with routes, with tracks you do not. I generally use tracks and the compass pointer screen. Which should always point in the direction you should be travelling in.