Briefly.
- No (auto)recalculation: That Kurviger can’t start navigation even when correctly positioned onto the last track segment toward the target Via Finish Point is remarkable.
- (Auto)recalculation (due to off track or by a manual trigger): If resulting in an unexpectedly bad route trajectory proposal pse to be able to reject by offering an ‘undo’ function.
The very similar Locus (gpx) track navigation mode uses a gpx track with attached turn instructions & Via Points. At any “on track” position a navigation (re)start is possible without refusal nor hassle.
By the way.
The big advantage (as with the similar Locus gpx track mode) is that track navigation is immediately ready to operate without any (re)calculation as the necessary turn instructions and Via Points are already attached in the file. It is only when you subsequently change the trajectory, for whatever reasons, that you need a (re)calculation. Without route change, the file method is stable and independent of any mobile router machine(s) or routable map. A pure (Locus) track navigation can even be done without a map (or a blank) present. (Ideal for off road trajectory designs)