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Second Substitute Pennant
Second Substitute Pennant Picture
International Code of Signals - Nautical pennant used by ships at sea and the U.S. Navy. This short pennant is described as being vertically divided in half with the colors blue and white. This pennant is known as the second substitute or replacement.
Pennant Code Meaning
Substitute for the second flag in this hoist or Absence of chief of staff (Inport).
The use of substitutes is to enable the same signal flag, either alphabetical flag or numeral pennant, to be repeated one or more times in the same group, in case only one set of flags is carried on board. The second substitute always repeats the second signal flag of that class of flags which immediately precedes the substitute.
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U.S. Navy Signal Flags