| abstract |
(57) [Summary] [Problem] To reduce the overall time required for positioning. A starting means starts in a hot start mode when satellite information or the like is stored in a backup memory, and starts in a cold start mode when satellite information or the like is not stored. Time limit setting means 1 5 sets the first set value Tc to the time limit TL when the activation means 14 is activated in the cold start mode, and sets the second set value Th when activated in the hot start mode. As described above, by setting the time limit TL to the values Tc and Th according to the activation mode, it is possible to shorten the total time required for positioning. |