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Checkpoint checker & helper - sign teams in & out, make sure they have their mandatory gear in their sled, and direct them to where they can park their team, or meet their handler. Tell the handlers or mushers where they can access water. Keep food and water available for the mushers/handlers in the tents and at least one fire going in the wood stove in one of the two tents. At the ending of the event, help take the checkpoint down and clean things up.