GPS-position-finding system and method of finding position of GPS terminal

摘要

A position-finding system is comprised of a terminal (1) having a global positioning system (GPS) for finding a position thereof, and a server (4) which calculates an altitude of the terminal (1), based on terrain data in an area in which the terminal (1) is. The terminal (1) includes a controller which selects one of three-dimensional position-finding in which a position is calculated through the use of four or more satellites and two-dimensional position-finding in which a position is calculated in a circumference in which only three satellites can be captured, in accordance with the altitude data provided from the server (4).