I. Introduction

     In recent years I have described the operation of bicycle cyclocomputers as precise revolution counters with fractions of a revolution read from  synchronized wheel-rim markings (http://home.earthlink.net/~caverhall/newrevcounter/abstractcontents.htm). These are advantageous replacements for the mechanical Jones meter in the RRTC Method for race-course measurement.

     Unfortunately many of the suitable cyclocomputers are no longer available, and there has been a proliferation of wireless models which have many disadvantages over wired types, and often do not work for course certification because they do not register trip distance at slow speeds. However production of the Protege cyclocomputers by Planet Bike will continue indefinitely, and happily these are by far the best as revolution counters. They are unique in suitable cyclocomputers in that wheel circumference can be set as high as 9.999 meters, so that they can  be operated as single-revolution counters with only a single magnet on the wheel .

     In view of the importance of the Proteges I decided to devote this report exclusively to a detailed description of their operation for course measurement. Measurers need only go as far as the section on "Basic Measurement Procedure" to get started with measurements. Later sections describe efficient methods made possible by the advantages of the Proteges.