Thought I’d piggyback on this thread instead of add a new one. I’ve used an Ambit 2 for a long while and want to upgrade to a gps watch with optical hr. I’m mostly interested in the 24/7 hr tracking, “stress/sleep” features, and elevation gain/loss features. I know that the chest strap is the way to go with HR, but honestly for my purposes something that’s “within the ballpark” for HR is fine with me. Has anyone used the Forerunner 645 for ski touring or trail running? Trying to avoid going with the Fenix 5 and would like to keep it under $300.