I decided to give the Android navigation app, Waze, another go. I came away sadly disappointed. It has improved little - at least here in the UK. The map, which is pretty much key to the product, is massively lacking. Yes, I can see improvement in the large urban areas and yes, it does now manage to route me close to point to point, however, due to the poor map, unconnected roads still lead to '10 mile trips' to drive half a mile down the road. That means you just can't use it for navigation and thus the main feature of the product is a big fat fail.
It is a such a shame the developer didn't use OpenStreetMaps. So blinkered on getting their own map. At the rate it's going they will never have a sufficiently complete map of the UK for it to work. It's classic chicken and egg. You need users to build the map but if the navigation doesn't work people will just use Google Navigator instead, and the map won't improve. It's been over a year since I last tried Waze and it hasn't really got any more usable.
It really is a crying shame. The concept and way traffic data is crowd source is genius. Real time traffic is just what you need to optimise the commute. Sadly it just doesn't cut it as a navigation solution. If only they'd used OpenStreetMap.