Patent ID: 8086421

Claim:
An athletic performance monitoring system, comprising: a global positioning monitor that receives satellite signals; a physical performance monitor that monitors acceleration; a non-transitory computer readable medium with computer-executable instructions stored thereon; and a processor programmed with computer-executable instructions from the non-transitory computer readable medium to cause the athletic performance monitoring system to perform the steps comprising: (a) determining a library of calibration data or correction factors for a plurality of different athletic performance use conditions using data from the global positioning monitor; (b) determining when satellite signal data is available during an athletic performance; (c) when satellite signal data is available for a first portion of the athletic performance, determining speed and distance of an athlete during the first portion of the athletic performance with data contained in the satellite signals received at the global positioning monitor; and (d) when satellite signal data is not available for the first portion of the athletic performance, then: (1) determining a use condition for the first portion of the athletic performance, (2) determining first calibration data or a first correction factor for the first portion of the athletic performance based on the use condition determined for the first portion of the athletic performance, and (3) determining speed and distance of the athlete for the first portion of the athletic performance using acceleration data monitored by the physical performance monitor, wherein the speed and distance determined from the acceleration data for the first portion of the athletic performance is calibrated or corrected using the first calibration data or the first correction factor determined for the first portion of the athletic performance.