Method and system for displaying scaled, precise maps on personal navigational aids

摘要

The invention provides for a system and method in which the global position of a mobile terminal is estimated from GPS (global positioning system) signals transmitted from a number of GPS satellites and received by the mobile terminal. The degree of precision of the estimated global position is determined and the size, or scale of an area to be displayed is determined according to the degree of precision, and a map of the area of the determined size is generated according to the global position of the mobile terminal, and displayed on the mobile terminal. In a preferred embodiment, a number of GPS satellites whose transmissions are higher than a predetermined SNR may be selected from which to receive signals.