A portable device for tracking sports activity performed by a user to whom said portable device is associated, comprising a microprocessor (11), memory means (15) for storing information, a GPS module (13) for calculating the position of the device and a display (12) for providing visual information. The portable device is configured to establish, from the information captured at least by said GPS module (13), at least one marker associated to the sports activity performed by said user and to store said at least one marker in said memory means (15). The portable device being characterized in that it comprises an RF module (14) implementing a short-distance wireless protocol, said RF module (14) being configured to be set to work in broadcast mode, thus enabling the portable device to broadcast a message comprising an identifier of the portable device and said at least one marker associated to the sports activity performed by said user. Method for tracking sports activity.