Hello, my Fenix 5 calculated me a FTP index without power meter? Is It possible that this number are correct ? I thought that the the power meter is necessary.
It's probably possible to do some basic estimate of FTP based on speed/weight etc but it would be massively inaccurate; not sure how the Garmin would be doing this without a power source.
Do you use an indoor smart trainer at all? perhaps you do and connected it to the watch?
Most smart trainers will broadcast an estimated (but generally quite accurate) power reading.
