Start preparing your camp well before dark. Look for a natural shelter, such as a rock overhang or a thick stand of evergreens. The site should be dry and well-drained and should offer protection from the wind. Ideally, it also should be near water and plenty of firewood.
Consider laying out your shelter site so that your snowmobile will be visible by a rescue aircraft.
If no natural shelter is available, you can build a lean-to. A lean-to is constructed by leaning branches against a horizontal support to form a roof.
Orient the opening of the lean-to away from the wind.
Cover the frame with evergreen branches to block out wind or precipitation (or use a tarp if you brought one). Leaves and twigs are another option.
For additional protection, add side walls to the lean-to and insulate the floor with evergreen branches or leaves.
Place your snowmobile in the shelter's opening to act as a wind break.