Bidarrah – an Eskimo open fishing transport and race boat. It is the oldest boat type that the Chukchi Sea peoples have. It is light, has a timber frame, and is tightly covered with seal or walrus skin. Large Bs were 10 m long and had a square sail made of ringed seal skin of about 10 m2. To hunt whales and other sea animals outside the shore, the navigability of Bs could be improved by fastening inflated seal skins to the broadsides. The racing B. usually has six rowers and a helmsman.