High-end Garmin watches as well. The fenix 7 can do 48+h including tracking, the Enduro2 will likely go 3 days. And yes, elevation is bonkers, because GPS elev

High-end Garmin watches as well. The fenix 7 can do 48+h including tracking, the Enduro2 will likely go 3 days. And yes, elevation is bonkers, because GPS elevation via watch is about as precise as you guessing. (+/- 400 feet on Garmins, but I'm not sure there are any watches significantly better than that. )