Page 603 - Bob Holtzman "The Field Guide to Knots How to Identify, Tie, and Untie Over 80 Essential Knots for Outdoor Pursuits"

A Bowline (shown) is a good knot to begin the tie-down process. A Slip Knot Trucker’s Hitch secures the canoe
to the roof rack crossbar on the other side of the car. Similar knot combinations should be used on both
crossbars, and from the bow and stern of the canoe to the front and rear bumpers or tow hooks on the vehicle.

Boats and Roof Racks

At highway speeds, the wind can exert hundreds of pounds of force against a

boat on a vehicle’s roof rack. Add in the jolting that is likely to occur along
the typical access road to the put-in, and the need for a really secure tie-

down system becomes clear. Canoes, sea kayaks, and rowboats should have

a minimum of three tie-downs: one across the boat at each end of the roof

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