Fenix for military use question...

Evening: grateful for any advice or tips: I recently purchased a Fenix 5 (non-sapphire), because I was on a training course, and all the instructors had them. And I am impressionable.

I wear it constantly, and love the training feedback it gives me. The GPS, Altimeter and Barometer are also really useful, and as long as I calibrate, they seem to be pretty accurate.

I am interested to know whether anyone uses their Fenix for extended periods in the field, and whether any preparation/accessories are required. Or do you all go back to your G-Shocks when you're digging holes in the ground?