Audiovox Electronics NVX226 3 3.5-Inch Portable GPS Navigator All in one car navigation system features 9 function keys that can be set to your preference Advanced High Resolution TFT Screen with clear voice and visual present for instruction Route Calculation and automatic re-routing when your car deviates from the planned route Estimated time of arrival, distance to go, time to go, and miles per hour automatically calculated The accuracy of the GPS position is typically better than 5m (16FT) for 95% of the time under optimum conditions