OK - I did some in vehicle trials and this is what I found out.
1- The GPS accuracy is high and it has 3D lock.
2- The maps do not turn or rotate randomly after I stop, they revert back to North, meaning that every time I stop , the map spins around to face north on top.
3- In the F500BT, there is an option to "keep position on road", this is by default set to ON meaning that if you enter a parking lot or a driveway, the arrow stays on the street, this is annoying and the only way to change it was by changing the vehicle type to "pedestrian mode", if you turn if off and start moving it will tell you that you are going to fast for pedestrian mode and turn it back on along with changing the vehicle position to "On Road". So the work around is - change to pedestrian , turn "keep position on road" to OFF, change back vehicle to car.
I found that turning this back ON fixes the map rotation, it keeps my car on the road but also doesn't revert back to north when i stop.
I guess this question is for the Gurus - is there a way to let the GPS track you off road and keep your direction when you stop??