Place rocks around the fire to absorb and reflect heat. Keep up your fluid intake. Drink plenty of water. Do not eat snow because it will lower your body temperature. Melt it first.
Disorientation occurs quickly in wind-driven snow and cold.
Run the motor about ten minutes each hour for heat. Open the window a little for fresh air to avoid carbon monoxide poisoning. Make sure the exhaust pipe is not blocked. Exercise from time to time by vigorously moving arms, legs, fingers, and toes to keep blood circulating and to keep warm. Turning on the dome light at night when running engine.