South Face 

Not much of a description, so I'll add what I can.

Approach via the trail to Sentinel Pass from Moraine Lake. As of 2012, a minimum of 4 people is required due to park restrictions from bear activity. However,this is a very popular hike so it is easy to join up with others at the trailhead.

The Grand Sentinel is located about 1km beyond the pass, towards the Paradise Valley.

P1: Low 5th class, 15m. Start around the left corner and climb a short pitch to a ledge with a bolted belay.

P2: 5.7, 20m. Cracks and face climbing lead to another bolted belay at a small ledge below the obvious right facing corner.

P3: 5.8, 25m. Climb the corner past a bulge to a bolted belay at a ledge.

P4: 5.9, 25m. Climb cracks straight above the belay to the summit. An easier version goes left at about 5.4.

As in the description, the climbing is not terribly difficult for the grade, although there is some loose rock and runout sections. As an alternative, I would recommend the well bolted sport route on the west face, Cardiac Arête. This is a better climb IMO.

Thanks Hans, I've updated the "Getting There" for the areas.