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I tried TCX on the Buck Blinder diy ish. I didn't like how it popped up directions at the bottom. It seemed a little unwilling to do turn by turn as well. In the end I turned off the track and just followed a coloured line. It was actually nice not to have the beeping all the time. Problem is, if I'm not paying attention I can lose the track and not know about it because there's no warning beep. Be good if you could have the 'off course' alarm sound but not have to enable TBT nav.
hippy-
That's what I get with a gpx file. No TBT nav, but an off course meeple if I go off course. TCX can indeed fuck off with its TBT directions. Most of the time I find it's telling me not to turn off the road I'm on onto tiny farm tracks, dirt roads and footpaths. Not exactly helpful, given that I wasn't planning to anyway.
Brommers
Under 'routes', if you select one then look on the bottom LHS, you'll see options to export. I prefer TCX, it's a GPX track with rudimentary directions baked in.