When i am out cycling my tomtom spark 3 is recording my pulse. It gives a very low average of 100 bpm, which should be close to double as i have heard. Its really weird, and i think it has influence on the calorie count. I drove 15,41 km on my bicycle. The route took 40 munutes, and my device said it was 291 calories. Whrn my brother took a 70 minute route on his bicycle his spark 3 (not cardio) recorded the calories to 997. That is over triple the calories my watch said on a route thats not even double as long.
I just think its weird, and i hope theres a solution for the problem.