I've always kept a bottle of maker's mark in camp for medicinal purposes. (but never evere ever in the field guys)
Also a 100 ct. of ibuprofin, and some odorless flexall 454. (you never know when you are gonna strain a muscle chasing elk)
On GPS, maps and Compass:
No GPS will EVER replace my Silva boyscout compass and topo map. GPS can fail, esp. if you batteries croak in the cold or worse yet.. on that given day when you NEED it you can't aquire 3 satellites.
sometimes low-tech is the way to go.