Analysing terrain data
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The exposure grade does not take into account objective hazards (stone fall, seracs, etc) but only the consequences of the skier falling.
Low Exposure (E1): Exposure is limited to that of the slope itself. Getting hurt is still likely if the slope is steep and/or the snow is hard.
Medium Exposure (E2): As well as the slope itself, there are some obstacles (such as rock outcrops) which could aggravate injury.
High Exposure (E3): In case of a fall, death is highly likely.
Extreme Exposure (E4): In case of a fall, the skier faces certain death.
This is a fantastic adventure through some big, wild mountains which culminates with an exciting and remote ski descent. The majority of the terrain the adventure passes through (on both the way up and down) is extremely serious, and an avalanche at virtually any point along the route would be disastrous - save this one for when conditions are safe and you are confident that you can pass through steep terrain on all aspects in (relative) safety.
Begin by riding the Charamillon gondola and the Autannes chairlift in the Le Tour ski area and then make a descending traverse south until you are underneath the Col des Autannes. Put skins on and climb up to Col, passing through a narrowing midway up the climb. The last few metres to the Col are best climbed on foot and in icy conditions crampons may be useful.
Drop into the face east of the Col and ski this drifting right and minimising height loss before putting skins on again and ascending up to a little notch north-east of the Pointe des Grands. Skin/traverse east across the Glacier des Grands to locate the vague col at the top of the Pissoir Couloir.
Make an assessment of snow stability and if things look safe, drop in steeply to the line via a 5 metre wide, 40 degree channel.
Once in the main section of the line the skiing is fast, exhilarating and doesn't require much route finding - you're not going to get lost! As the couloir begins to open up, and the Trient Glacier begins to loom above you begin to drift left and ski perfectly spaced trees down to the foot of the Trient valley.
Once in the valley follow the clear track that leads out to the edge of Trient village.
There's a pleasant little bar/cafe in the village so grab a drink and then catch the bus back to Chamonix.