If you can will it give you real time navigation?
what do you mean by this? Sat nav ‘turn left, turn right’ style instructions? if so then you’ll be disappointed.
A GPS should only really be used as a navigation aid which suppliments a paper map and compass. as such you really don’t need to spend a fortune on digital maps.
Get the cheapest device you can find, get a map and compass and, more importantly, the knowledge on how to use them properly then get out and enjoy the wilderness.