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The only reason I was using the navigation (since I knew how to get home via the A44 and A40) was to test its navigation ability. I need to run this piece of crap through the ringer quickly because I don't want another case of the 810, where I had to argue to get my money back because I'd had the unit for 6 months.
The other thing was - it would be nice if it could offer a laney route that didn't almost double the distance home. It can't be that hard to find B roads that head in the same direction without adding massive overdistance.
hippy
skinny
This is why I navigate by following a coloured line on the map page. Sure I've missed junctions and added distance on, but I don't have to deal with route (re)calculations, and I'm pretty good at remembering the route anyway.
If I want turn-by-turn instructions it's a little bit more of a faff, but the Edge 705 was able to navigate against a similar track (made with GPXX extensions) so that it had no choice in the routing as each of the trackpoints it had to go through were only ~80 yards from the previous one.