A copy of the original signed and acknowledged instrument must be presented. The original instrument itself may be presented but is not required. The copy may be delivered to the National Vessel Documentation Center or transmitted by facsimile or in portable document format (.pdf) in accordance with the procedures in Sec. Sec. 67.218 and 67.219 of this part. Signatures may be affixed manually or digitally. [USCG-2007-28098, 72 FR 42312, Aug. 2, 2007]