I have Navigon and Tom Tom. I usually find Tom Tom much more accurate in terms of traffic. However, lately it's been failing me. It tells me there is a traffic jam and a better route is available. If I question it and continue on the first road that it chose, I usually discover the accident has long since been cleared up which means the data has to be at least an hour old if the cops and crashed cars are no longer there. I know Google added GPS but I don't know if it has traffic and rerouting. I tried Waze a few years ago and it always reported spurious traffic alerts too. If I sat at a red light too long it would say there were delays or a traffic jam. Ideas?