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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.
Brommers-
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.
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The GPX files don't contain TBT info, it's your Garmin and its installed maps take the GPX track and then give you TBT. That's why it takes a bit of processing when you select 'follow course'.
I don't know about that distance to next stuff. I don't use that.
hamrack
hippy
So you export a GPX course and navigate with it but with TBT turned off?
My GPX files give me TBT on 800 and 1000 if I have it enabled, which I usually do. The difference with the TCX is it pops up little notes for every cuesheet instruction as well ("Turn left toward Middlegreen Rd" or some shit).