I wouldnt put my eggs in one basket - use a combination of paper maps with a GPS and mount a good quality auto/marine compass (compensated) on the dash of your vehicle - saves having to get out to shoot accurate bearing with a hand held compass when its bloody freezing - carry a handheld compass too as a back up.
You will probably end up relying on local knowledge more than you think, though everything locals say has to be taken with a pinch of salt - use it to back up what you think is a correct route, not as always accurate.
I prefer using a handheld GPS in an auto mount - the Garmin 60CSX/62 or the new Montana are flexible units.
GPS do work in the cold, if its on the dash it should be warm enough- if you are operating it handheld, keep the unit warm under clothing next to skin and use a remote antenna velcroed onto your pack for a reliable signal.
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