Time for correct information on satellites at the location of this incident.
GPS satellites are in medium-altitude earth orbits (MEO) at 20,200 km (12,600 mi) altitude, designed to provide global coverage with at least 6 satellites visible at any time. As others have pointed out, fewer satellites may be visible for many reasons, but you only need 3-4 for a pretty good fix. More at www.gps.gov
SPOT devices send GPS positions through Globalstar satellites, and do not use Doppler ranging. 32 Globalstar satellites are in low-altitude earth orbits (LEO) at 1,400 km (870 mi) altitude, which could provide global coverage. Globalstar restricts coverage for economic and legal reasons.
The location of this incident (Columbia Icefields in Jasper National Park), is very much inside Globalstar's simplex data coverage area, with a downlink station a few hundred miles away in High River, Alberta. For Globalstar, that's about as good as it gets.
PLBs use two different satellite systems in different ways. Geostationary satellites "hovering over the equator" at 35,786 km (22,236 mi) relay GPS fixes from PLBs to ground stations. LEO satellites can compute a PLB position independently using Doppler ranging. More at http://www.sarsat.noaa.gov/emerbcns.html.
So theoretically, as far as the satellites are concerned, a SPOT emergency beacon at this location should have no trouble getting a GPS fix and sending that position accurately through the SPOT system.
In practice, we've seen many reports of SPOT signals not delivered, or delivered with wildly inaccurate positions. Combined with operational misunderstandings by users, and SPOT devices have a poor reputation for reliably reporting positions.
I believe that many SPOT problems which are attributed to user error, actually originate with the poor design of these devices. Why should you have to Memorize The Fine Manual in order to use something properly under the highest-stress conditions? I'll save that rant for another time.
And for more than you wanted to know about satellite systems and devices, start here.