Börteboote are traditional Helgoland passenger boats used to ferry visitors from Seebäderschiffe to the island. They are typically about 10 meters long and 3 meters wide, built from solid oak, with an interior diesel engine, and they can carry around 40–50 passengers per trip. The term Börte comes from the association of shipowners who organized this outward transport, historically called “Ausbooten.” Today’s Börteboote are noted for their seaworthy construction, with the hull built in clinker fashion on the upper planks and a carvel/kräwele (crane) planking below, enabling reliable operation in coastal conditions. They remain iconic symbols of Helgoland and are also employed for fishing and deep-sea angling, besides passenger transport.
If you’d like, I can pull up additional sources in German or translate key passages, and I can also compare Börteboot specifications across cited depictions.