Thread: About 37xx converted to 34xx satellites reception accuracy

I think it's conclusive that the jumping is a factor of the lock to road feature and not a result of satellite (in)accuracy. My 3490 doesn't do it at all with any map large or small. Giomen didn't respond to my question following his post (the first link by Caty):

Originally Posted by Neil

@giomen
Are you saying that the 'lock on road' (snap to road) function in 34xx is less efficient or less sensitive than other Nuvis?

I then forgot about it, but i can't recall anyone reporting this problem when their 34xx is in 'off road' mode which disables the magnetic lock on road feature. It's of no real consequence whether the lock function is 'less efficient' or 'less sensitive' as i asked him, but if users reporting jumping in normal routing (simulated or real) don't experience it in off road mode then it's definitely not related to the accuracy issue in 34xx.

Got hold of a 3790 to test with the 3490 convert. Did a 40min drive with them side by side. Cloud was full overcast. Stationary, the stabilised 2D accuracy was close (only generally a metre discrepancy) but moving was remarkably different. Couldn't do any camera shots while on the move as i was by myself, but i noticed that the readings of the 34 were up to double that of the 37 at times. e.g. 37 at 3m / 34 at 6m and 37 at 4m / 34 at 8m were the worst comparative 'at the same time' results. The overall individual best/worst readings that i saw: 37 was 3/6m, and 34 was 4/10m. Of even greater discrepancy was the elevation, at times while moving there was up to 30m difference, but less when stationary. As i was in familiar territory, i have to say that the 37's elevation reading were certainly the more accurate of the two. Compare the satellite locks in the 2 pics. They are not the same, maybe this is the answer as to accuracy problems. It seems to me on these results that 34 is much worse maintaining both 2D and 3D accuracy especially when moving. Just shot my own 'urban myth' hypothesis to hell! Two pic's are at the start and finish of the trip: