Mobile device location

1. 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;

updating the location of the mobile device according to the selected locational update frequency;

upon entry into the target region sending an incentive associated with a business establishment located within or associated with the target region to the mobile device; and

designating the target as having been entered to prevent repeatedly sending the incentive message to the mobile device.

2. The method of claim 1 , wherein each of the zones defines a region of space that is a respective predetermined distance from a centroid of the target.

3. The method of claim 2 , wherein each of the zones defines a region of space that is a respective predetermined radius from the centroid of the target.

4. The method of claim 1 , further comprising removing the target from a list of targets sent to the mobile device.

5. The method of claim 1 , wherein the plurality of zones includes first, second and third zones that respectively define first, second and third radii relative to the target, and wherein the second radius is greater than the first radius, and the third radius is greater than the second radius.

6. The method of claim 5 , further comprising:

if the mobile device is determined to be within zone 1 or zone 2, but the mobile device has not entered the target region for more than a threshold period of time, then disregarding the target for a predetermined period of time.

7. The method of claim 1 , further comprising turning off GPS for the mobile device when the mobile device is located in one or more predetermined zones.