Mobile device location

A method of determining a location of a mobile device, comprising:

• defining a target region having a polygonal or circular shape;
• defining a plurality of zones, each of the zones defining a region of space that is a respective predetermined distance from a target located in the target region;
• defining a respective requested locational accuracy for each of the plurality of zones, wherein zones closer to the target have a higher accuracy than zones farther from the target;
• defining a respective locational update frequency for each of the plurality of zones, wherein zones closer to the target update in response to less movement than zones farther from the target;
• determining in which of the plurality of zones a mobile device is located;
• selecting the requested locational accuracy based on the determined zone;
• determining a location of the mobile device according to the selected requested locational accuracy;
• selecting the locational update frequency based on the determined zone;
• and
• updating the location of the mobile device according to the selected locational update frequency.