How to choose a good GPS navigation system ??
Firstly, Determine how much you want to spend on in dash GPS system for your auto,
Secondly, List portable GPS navigation system features that you're seeking, like the United States map in details, voice guidance,
Thirdly, Visit as many online retailers or visit a few nearby stores as you want to look at the available GPS navigation systems
Forthly, A major drawback of the in dash GPS navigationsystem is the lack of an internal compass, accelerometer or a device used to measure the car's speed
They have specilized in manufacturing auto parts for several years.the price is much reasonable than others,and also satisfing quality