Gps watches

[Latege]

I've no reason to doubt my wrist based heart rate. Seems accurate enough for my needs and don't need any additional kit. The only time I have noticed any issue was when I was on my bike on an indoor trainer and obviously must have had my wrist at an odd angle as I apparently flat-lined!

Thanks. I don't suppose you've used it anywhere very hot and humid have you? - I'll be living mostly in a tropical rainforest area so trying to imagine whether the sweat factor will affect a wrist strap more or less than a chest one. I assume you have to keep the strap fairly tight to your wrist.