I use to plan my trips witch BRouter, so without using GPS or anything (just my 1" dem files I suppose). The thing is that the elevation profile that I obtain is often quite incorrect. Especially when it goes for the max altitudes.
I can't understand why though. If the altitude data I have on map are correct, shouldn't be correct the planned track data too?
I mean, for example, I plan a hike from A to B. On map it says (correctly) that A = 1700m high and B = 2800m high.
Than I use brouter, and the route stats gives like A=1700m, B=2700m.
So, the starting point is usually correct, or with errors of some meters, but the last point gives errors of around 5% - 10%.
I would understand that if I used GPS for my tacking, but in this case I'd like to know if this is just normal or it could be solved.