Patent ID: 7572205

Claim:
A method to facilitate physical training, the method comprising the steps of: having a user wear a GPS logging device which includes a user output interface; having the user travel through a race course; automatically logging a plurality of waypoints along the race course; entering into the GPS logging device a checkpoint interval based either on a time interval or a distance interval; having the user select a finishing goal time and entering it into the GPS logging device; having the user travel through the race course a second time; automatically logging a plurality of waypoints along the race course for the second travel through the race course; receiving from the GPS logging device at the check-point interval, a calculated delta indicating a comparison between the user's first and second elapsed time or distance histories during the user's second travel through the race course; receiving from the GPS logging device at each of the checkpoint intervals a signal indicating how far ahead or behind the user is at that position based on the finishing goal time during the user's second travel through the race course calculated using the following normalization algorithm: a. calculating a (first interpolated time) at the checkpoint interval through the process of selecting the closest two positions to the current position from the elapsed time history of the first travel through the race course and using the two positions to interpolate what the user's first time was at the user's current position; b. calculating a Delta 1 comprising a difference between the user's first total elapsed time for the course and the finishing goal time; c. calculating a percentage of work completed using the formula: (first interpolated time)/(user's first total elapsed time for the course) d. calculating a Delta 2 comprising the formula: (percentage of work completed)×(Delta 1 ) e. adding Delta 2 to the (first interpolated time) to get a target time (Tc) f. comparing the elapsed time at the current checkpoint to Tc to determine the time the user is behind or ahead of the goal time; and g. notifying the user of being time “behind” or time “ahead” at the current checkpoint.