Bumpkin
Registered user
Will it sometimes make 'mistakes', routing bods left right left through a town, when the most logical route is to go up to the roundabout and turn left. It missed out the roundabout route, prefering the left right left, as both routes could be conducted on 30 mile an hour roads, the left, right, left being simply 200 yards shorter (and maybe even more direct, in strict terms) than going up to the roundabout and turning left, so to the dumb device it satisfied both the quickest and most direct criteria.
That the left right left took you through an industrial estate, or busy shopping street, with umpteen pedestrian lights all on red is not its fault. It does not know, east Helsinki any better than you do. But it got you there, from your front door, via Rome and Leipzig, all down great twisty roads, mate. So, don't be so tough on it, it's probably cleverer than you.... Most of the time.
Exactly; Expecting it to take every traffic light, give way, sharp bend in the road into account is expecting too much. especially across a route traversing distances of hundreds of miles. Adding any such additional data to the mapping would result in further massive file size bloat, slower route calculation and be a continual update nightmare for Navteq. People will be asking for potholes to be added next and then complain when they've been filled in and remain on the mapping data. We're spoiled enough as it is that it looks at speed limit data and bases its calculations on that.
My one observation is that the ETA is pretty consistently optimistic, especially in the car. It could do with either tweaking downwards of have a setting in the menus where you could enter a factor to compensate for your type of use. I can only assume that in the US, with it's simplified and generally straightened road network, the ETA calculation is more accurate. I'm aware that changes can be made in Mapsource and Basecamp but these settings are not transferred to the GPS when you load a route. Additionally, some claim that the GPS learns your riding/driving habits, IMHO it's not that clever.

Clicked on my finish point and let Basecamp plot the route THEN dragged the route across to where I wanted it to take me ... so I can now see the fundamental flaws and risks as outlined in the previous posts ... ta.
