Yes if heading in a northerly direction, but would have drawn them west if heading in a southerly direction. It definitely suggests they were doing something wrong navigationally using a map and compass. Small errors over time add up to create big errors unless they are compensated for.

After looking at the Mag declination in the area, moving approx 50 miles west of Calgary the Mag declination itself moves a quite considerable 0.5 degrees. The nearer you get to the magnetic north pole the tricker it gets when using a compass for accurate navigation.

http://www.magnetic-declination.com/

The area looks like a wonderful area to get lost though.