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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...
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.