Every year, in northern Norway, several public agencies authorise a few days of GNSS jamming and spoofing transmissions around the island of Andøya, so that manufacturers and operators can put their equipment through real conditions. The exercise is called Jammertest [1], and it is the largest of its kind open to the public. During the 2022 edition, one participant left the Strava app running on their phone in the middle of a spoofing trial. They promptly posted an accidental personal best [2]: 6.44 kilometres in 5 minutes and 50 seconds, with 495 metres of elevation gain. Their phone was not part of the trial. A falsified positioning signal travels into everything that listens to a GNSS receiver, including equipment that has nothing to do with navigation.