SS Portmar

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A number of ships have been named SS Portmar.

Portmar was a United States-flagged merchant vessel that was constructed in response to World War I, operated by a succession of companies in the interwar period, then taken up for wartime shipping in World War II.

United States Shipping Board

The United States Shipping Board (USSB) was established as an emergency agency by the Shipping Act, September 7, 1916.

Gross register tonnage or gross registered tonnage, is a ship's total internal volume expressed in "register tons", each of which is equal to 100 cubic feet (2.83 m3). Gross register tonnage uses the total permanently enclosed capacity of the vessel as its basis for volume. Typically this is used for dockage fees, canal transit fees, and similar purposes where it is appropriate to charge based on the size of the entire vessel.

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MS <i>Birger Jarl</i> listed historical ship in Sweden

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