One thing I'd like to throw in is the benefit of using phones which have a GPS built in.

I recently purchased a new Blackberry Pearl 8130 which has a GPS built in. I live downtown and have had mixed results with getting a lock amongst all the buildings with some GPSs. Yesterday I fired up google maps (the mobile application for phones and PDAs) and it gave me the option to find my location without the GPS signal using tower information. It pin pointed me to within 300m.

Granted this requires the phone to be able to talk to a tower but if for any reason the GPS won't work (heavily wooded area? Weather? etc?) and you're within range of a tower (there are quite a few areas in Jasper which are like this), it's just another tool in the box which can help you find yourself. The other benefit with google maps is that if there is a road, cut line, etc. nearby it is likely to show in the satelite images.