PORTABLE EQUIPMENT
Portable device, like a digital camera, is equipped with a GPS receiver, thereby detecting a current position. When a change does not occur in the detected current position for a given period of time or more, the position is considered to be a living sphere, like a user's home. When the user is situated in the living sphere, a receive cycle of the GPS receiver is increased so as to become larger than a normal receive cycle, thereby reducing power consumption.
1 . Portable device comprising:
positional data detection means;
registration means for registering positional data pertaining to a user's living sphere; and
control means that relatively increases a position detection interval of the positional data detection means when detected positional data correspond to the positional data pertaining to the living sphere than when the detected positional data do not correspond to the positional data pertaining to the living sphere.
2 . The portable device according to claim 1 , wherein the living sphere is a neighborhood of a position where a user stays for a given period of time or more.
3 . The portable device according to claim 2 , wherein the living sphere is a neighborhood of a user's home.
4 . The portable device according to claim 1 , wherein, when a change does not occur in the detected positional data for a given period of time or more, the registration means automatically registers the positional data as positional data pertaining to the living sphere.
5 . The portable device according to claim 1 , wherein, when the detected positional data correspond to the positional data pertaining to the living sphere, the control means sequentially increases the position detection interval according to a sojourn time.