Freight ship or ferry with facilities for vehicles to drive on and off (roll-on roll-off); a system of loading and discharging a ship whereby the cargo is driven on and off on ramps. Equipped with large openings at bow and stern and sometimes also in the ...
Sierra - S = signal letter and flag. Morse = ( . . . )Flag= White background with central blue square.When hoisted singly from a ship it means : "Engine going full astern."
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