Walking error correction for a device and method for containing and tracking a subject using satellite positioning data

A device configured to be disposed on a subject for determining the location of the subject, the device comprising:

• A positioning unit for generating each time period, t, position data corresponding to the location of the subject and motion data indicative of whether the subject is moving or stationary, wherein the motion data includes linear acceleration data regarding the subject;
• A processor unit, responsive to the position data and motion data, configured to:
• if the motion data indicates that the subject is moving at time period t, set the location of the subject at time period t to be the location corresponding to the position data;
• and
• if the motion data indicates that the subject is stationary at time period t, the processor unit is configured to:
• obtain from the positioning unit the position data for the next n time periods t;
• determine the average position of the subject over the n time periods t;
• and
• maintain as the location of the subject, the determined average position while the subject remains stationary.