Quote:
Originally Posted by jdbretz
I agree completely! The Nav in my 335i once routed me 67 miles out of the way on a 180 mile total distance trip. Luckily I knew how to get back and caught it before I started following the directions. The biggest thing I hate about it too, is even when it routes you the wrong way, it will continue to tell you to do a U-turn for the next 20 miles before it updates and send you the way you should have gone in the first place. Bmw gets a HUGE  on their routing protocol. I haven't used the newer hard drive based Nav but hopefully they fixed all these issues. |
I am convinced it isn't the "BMW Routing Protocol", but rather the 'TeleAtlas Data' that is defective: Buried within the data is a 'discontinuity' or 'defect' that the system views as either an "open" in the road, or a section with a very, very low average speed- like a negative number. Hence the algorithm does not choose it as a viable path... and it is not until you cross over the defect that the algorithm then no longer sees the discontinuity and can properly route.
I am convinced that there are broad and manifold data defects in the teleatlas dataset BMW is selling us....