I did quite like Waze for most reasons but once the ETA started to drift inexplicably, I started to trust it less. I would leave for a 2 hour journey and it would estimate 1hr30, which would creep up to 2 hours by the time I arrived at home. No traffic, no delays so why didn't it start at 2 hours ETA? Some kind of gaming algorithm?<p>However, Google nav is far worse. It doesn't seem to log traffic on more minor roads and where I work seems to keep me in the traffic instead of taking me a slightly longer route which is generally quicker. As you sit in the traffic, the ETA just creeps up and up proving it is not measuring real-time positions which would tell it how slowly we are moving and therefore how long it is likely to take over that path.<p>We also had a very bad experience with Google where it sent us on a detour to avoid a serious accident on the motorway and pointed us, as well as everyone else, up a very narrow road despite a slightly longer route on a much wider "normal" road. It took an hour to get about 1 mile, when we finally rejoined the empty main road. Again, very concerning that Google doesn't seem to understand that sending everyone up a slightly more direct route doesn't work when it blocks everything up. It took us a number of other interesting routes and took us about 3 hours longer than the 3 hours it would normally take. Sometimes I wonder if it shouldn't just say, "Everything's rammed, just wait it out here".