Abstract: A device and method for measuring, calculating and displaying swim related information includes a waterproof enclosure with an internal microcomputer programmed to calculate various indicators of swim performance including number of strokes, stroke cycle, stroke rate, velocity and swim stroke efficiency among others. The device is self contained and strapped to the swimmer's wrist during swimming. Function buttons on the exterior of the device control its operation and allow the swimmer to select from various exercise modes and display features. A swim stroke is detected by the use of metallic sensors which extend along the top surface of the device. The sensors act as a short circuit when submerged in water to cause an interrupt condition of the internal microprocessor corresponding to a stroke. The device is secured to a swimmer's wrist by one or more adjustable straps.

Abstract: A method and apparatus of measuring a swim performance and swim stroke efficiency uses a microcomputer based hand mounted device that can be worn by the swimmer during the swim exercise. The device is secured to a swimmers hand by an adjustable strap and fits roughly within the area defined by the user's fingers. An internal timer and contact switch within the device permit time keeping and stroke counting functions, from which the internal microcomputer derives a plurality of swim performance factors. The device is battery powered and has a "low-battery" indicator to warn the user in advance of total power drain. Swim performance can evaluated via a LCD and a variety of numeric and graphic indicators. The device can be a used by a swimmer to determine swim stroke rate, cycle rate, velocity, distance per stroke and other variables which effect swim performance. The data can be stored in an internal memory means and retrieved later by the user.