If you are looking for an excellent palm-pilot with a GPS add-on, this is probably not for you. It is not designed to be an outstanding palm. If you are looking for a GPS based nagivational aide with some palm capabilities, then this is excellent.The time to acquire satelites varies quite dramatically, but it does. I have even managed to track my location whiles flying. The location and airspeed were dead on, but the elevation of 50 ft seemed to be a bit low, considering that we were at 29,000 ft.Quick to re-calculate if you get off route. It has been accurate, with 1 exception. In Boulder Colorade (despite the basemap and detailed map being loaded, it couldn't find all the streets, and had me displayed in the middle of a lake once.All in all I am very satisfied with this product.