Patent ID: 8444499

Claim:
A system for automatically tracking shots of a golfer during a round of golf, the system comprising: a plurality of golf clubs, each of the plurality of golf clubs comprising a shaft and a golf club head, the golf club having an accelerometer in electrical communication with a wireless radiofrequency transponder, the accelerometer temporarily closing a switch during impact with a golf ball to provide power from a power source to the wireless radiofrequency transponder for transmission of a wireless signal, the wireless signal containing data for a specific golf club of the plurality of golf clubs, wherein each golf club of the plurality of golf clubs has the accelerometer, the wireless radiofrequency transponder, the switch, and the power source located within the shaft of the golf club; and the receiver having a second antenna; wherein the system captures a swing speed and swing motion of a golf club swung by golfer and wherein the interactions of characteristic three dimensional amplitude variations in the antennas allow for the measurement of relative positions of the golf club over the time of the swing.