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Golf club telemetry equipment sends signals to a receiver in a golf round data system. The signals uniquely identify the particular club a player has selected for a stroke and the fact that a stroke has been taken. The club identification can occur either before or during a stroke. Automatic detecti

Golf club telemetry equipment sends signals to a receiver in a golf round data system. The signals uniquely identify the particular club a player has selected for a stroke and the fact that a stroke has been taken. The club identification can occur either before or during a stroke. Automatic detection of clubs and strokes simplifies round data collection for the player. Club identification before a stroke permits a forecast of the result of the stroke to be presented to then player prior to the stroke. The signals can be either acoustic or electromagnetic.

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1. A golf data system comprising: circuitry, at a portable data acquisition device, configured to determine a location of the portable data acquisition device;an assembly configured to be coupled to a shaft or grip of a golf club, the assembly including a sensor adapted to detect that the golf club

1. A golf data system comprising: circuitry, at a portable data acquisition device, configured to determine a location of the portable data acquisition device;an assembly configured to be coupled to a shaft or grip of a golf club, the assembly including a sensor adapted to detect that the golf club has been lifted from a golf bag; anda transmitter configured to emit a signal including identification data unique to the assembly based on a detection by the sensor that the golf club has been lifted from the golf bag; anda memory, at the portable data acquisition device, configured to receive the identification data unique to the assembly, and store the identification data unique to the assembly in association with the location of the portable data acquisition device. 2. The golf data system of claim 1, wherein the transmitter is configured to emit the signal based on the detection that the golf club has been lifted from the golf bag and stop transmitting the signal after a predetermined period of time. 3. The golf data system of claim 1, wherein the transmitter is configured to intermittently emit the signal based on the detection that the golf club has been lifted from the golf bag. 4. The golf data system of claim 3, wherein the transmitter is configured to intermittently emit the signal based on the detection that the golf club has been lifted from the golf bag and stop transmitting the signal after a predetermined period of time. 5. The golf data system of claim 1, wherein the sensor is adapted to detect that the golf club has been returned to the golf bag. 6. The golf data system of claim 5, wherein the transmitter is configured to stop emitting the signal based on a detection by the sensor that the golf club has been returned to the golf bag. 7. The golf data system of claim 5, wherein the transmitter is configured to emit the signal based on a detection by the sensor that the golf club has been returned to the golf bag. 8. The golf data system of claim 7, wherein the transmitter is configured to emit the signal based on the detection that the golf club has been returned to the golf bag and stop transmitting the signal after a predetermined period of time. 9. The golf data system of claim 5, wherein the transmitter is configured to intermittently emit the signal based on a detection by the sensor that the golf club has been returned to the golf bag. 10. The golf data system of claim 9, wherein the transmitter is configured to intermittently emit the signal based on the detection that the golf club has been returned to the golf bag and stop transmitting the signal after a predetermined period of time. 11. The golf data system of claim 1, wherein the assembly further includes circuitry configured to receive data from the sensor and determine, based on the received data, whether the golf club has been lifted from the golf bag. 12. The golf data system of claim 1, further comprising: a display, at the portable data acquisition device, configured to display the information stored in the memory. 13. The golf data system of claim 12, wherein the memory, at the portable data acquisition device, is configured to store an association between the identification data unique to the assembly and the golf club. 14. The golf data system of claim 13, wherein the association includes information identifying the golf club. 15. The golf data system of claim 13, wherein the display is configured to display information corresponding to the association between the identification data unique to the assembly and the golf club upon receiving the signal emitted from the transmitter. 16. The golf data system of claim 15, wherein the information corresponding to the association between the identification data unique to the assembly and the golf club that is displayed is information identifying the golf club. 17. The golf data system of claim 14, wherein the display at the portable data acquisition device is configured to display a map feature corresponding to a golf course together with the information identifying the golf club and the location at which the signal was received by the portable data acquisition device. 18. The golf data system of claim 13, wherein the identification data unique to the assembly stored in association with the location of the portable data acquisition device is stored in the memory of the portable data acquisition device as a golf stroke taken with the golf club associated with the identification data. 19. The golf data system of claim 1, wherein the sensor is at least one of a photosensor, an accelerometer, a motion detector and a tilt switch.