Samsung already make a watch, except aside from the heart rate monitor it doesn't have any features not already in your Samsung Galaxy phone. No compass, no GPS, no therometer, no pedometer, no barometer, only 3 days battery life, and only mildly waterproof. An actual watch seems more sensible for outdoor types
http://www.samsung.com/au/gear/gearfit_specs.htmlThe sales pitch is "receive & access notifications from your phone on your wrist". But is that relevant to the outdoors at all, particularly when you're out of mobile coverage?
If you really wanted a heart rate monitor you could just get one of these for a much lower cost
http://www.ebay.com.au/itm/161298046534