Apparatus for determining when a swimmer turns

摘要

The apparatus comprises a portable housing which can be worn by a swimmer, for example in or on the swimmer's ear. A magnetic sensor in the housing detects a change of orientation of the swimmer relative to the earth's magnetic field when the swimmer turns and generates a turn signal which is sent to a processor. Alternatively, a shock sensor arranged to be strapped to the swimmer's ankle, for example, can be used to transmit a signal to a processor in the housing. The processor generates an output signal in the form of selected stored speech components to indicate to the swimmer parameters such as total elapsed time, number of laps or lap time.