A display apparatus for a navigational aid displays an own ship mark and a barge assembly mark representing respectively the shapes of own ship and a barge assembly, which are coupled to each other, in which the barge assembly mark includes segments arranged in columns by rows corresponding to individual barges within the barge assembly. The display apparatus reads information on a choice of a location within the barge assembly mark entered by an operator using a pointer and shows a mark indicating the presence or absence of a barge at the selected location, thereby enabling the operator to set the barge assembly mark of a desired shape to match the shape of the actual barge assembly.
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