The method makes it possible to measure a speed of a competitor, such as a skier or snowboarder, on a ski or snowboard course, by means of a measurement system with a transponder module worn by the competitor. The method includes the step of activating the transponder module which includes a measurement unit with at least one measurement sensor, as soon as the race starts, a step of measuring the speed of the competitor via the measurement unit during the race along the course, and a step of transmitting the competitor's speed measurement to at least one base station of a decoder device of the measurement system for a timing device in order to display the speed of the competitor in real time or continuously on at least one screen.