Chuy!, on Jul 9 2007, 10:41 PM, said:
That's 'cause you're auto-routing to the cache. You need to put it in "Off Road" mode.
That, unlike 'Lock on Road', should have no effect whatsoever on where the gps displays your position in relation to the map.
I've seen the same (apparently) jumping to a road and back zig-zag behaviour on my Vista Cx with firmware 2.7 but at the time put it down to multipath errors in the rather hilly area where I live. Looking at the track logs shows that it doesn't necessarily jump exactly to the road altthough at 'normal' 80m - 200m zoom levels on the GPS it certainly looks like it jumps to the road.
Here's an example. Neither 'Lock on Road' nor Routing was active at the time.
Curiously it never happened before and it hasn't happened since reverting to firmware 2.6.
As a possibly subjective generalisation, the tracklogs I've recorded using firmware 2.7 are junk in comparison to older tracklogs in the same areas.
It wouldn't be the first time that a firmware upgrade has fixed something and broken something else, nor would it be unheard of for undocumented changes to have unintended consequences.