hi there montybella, Garmin etrex h ??? not too sure about this one i`ve had a read through the manual but can`t seem to find have you can do it
(that`s if that model is able for the user to enter grid references??) without having one in my hand and playing around with it anm not much help sorry.
just try playing with it , get to main menu and see if you can get to a menu that will give you an option for you manually inputing grid ref. if you can then let me no what it say`s (ie what the layout looks like, how many space`s and so on) have you tried linking it up to a computer and setting it up that way??
let me no how you go
mal