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I found that TBT would sometimes just cease to give any directions at all, or would fail to recognise I had returned to the route if I left it, so would get stuck. I turned off TBT and just follow the line on the map. The advantage of TCX was that it tells you a distance until the next coursepoint, along with what kind of coursepoint it is (left turn, straight on, etc). TBT won't tell you that until you're close. 'Distance to Next' is not the distance to the next turning, but the next waypoint. Sometimes the TCX coursepoints are useless (as @danstuff said) but the ability to look down and see how far until the next time I had to pay attention is really useful.
hamrack-
Yep, I've had the same. Sometimes stopping and starting a Course will get TBT back.
Most audax routes I use are GPX tracks and don't have waypoints so that would explain why Dist to Dest is always the same as Dist to Next. They're always measuring the finish.
Maybe I'll try TCX again and see if I can get RWGPS to leave out cuesheet entries but include waypoints. Then Dist. To Next will show distance to next audax Control rather than me having to keep an eye on the distance all the time (assuming I add in the Controls as waypoints of course).
hippy
Don't think I've got TBT turned off. I think the GPX files I use just don't have that information. 'Distance to destination' and 'Distance to next' are always identical when I'm using routes I've downloaded, which suggest that the routes don't have any information about turns. I've used TCX files but can't recall any cuesheet information, but it's possible the TCX files I was using simply didn't have them.