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huh, I was under the impression that's what my method was doing - it instantly brings up the line on the map (rather than doing that "calculating" thing) when I load the map and it just looks like its overlaid the line I drew on ridewithgps on top of the map. Fairly sure it's not doing any of its own routing at all.*
I am on a Touring Edge though, so this stuff might be different on higher end models.
I have all that "recalculation" stuff turned off as well, so there's no funny business if I go off course (learned the hard way on this!).
*of course, being garmin, you're never entirely sure what is going on.
Brookly_Bay-
It sounds like you're both describing the same thing - you have a line on the map that is derived only from the GPX track you gave it (as either a GPX or TCX file). I know my Edge Touring has no option to 'always display' (not that I've found anyway), but you can select a route and it will display it. If you have TBT turned off (as @Brookly_Bay has) then it won't process anything, it just shows the route. Maybe it's how the two devices do the same thing. Who knows. Fuck Garmin, use Android, is my growing feeling...
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If you're choosing Follow Course and use a GPX or TCX the Garmin has to route it over the maps it has installed. It can't give you TBT if it doesn't have a map installed with corners, can it?
Maybe it appears instant but my 400k audax route on the weekend spent a good 30 seconds+ "calculating", even if the Always Display meant that my bright green line was visible. Once it has finished calculating the course, you can't really see the Always Display green line, it is covered by the standard PINK Garmin navigation line.
Touring Edge - I have no idea about this model so none of what I'm saying may apply.
hamrack
hippy
Yeah, that would work but I meant something different. Edit the course and set its colour to bright green or something. Then set it to "Always Display". Then you can follow the green line on your map without the Garmin trying to route you somewhere wrong and presumably uses less processing power as it's not calculating the course over its installed maps. You don't get stuff like Distance to Destination but it's better than the Garmin turning a 400k audax into a 600k because of its fucking stupid routing (which happened to me on the weekend and was why I stopped the Follow Course option in the first place, now I think about it).