US Navy YTL, 60-foot, 70 ton, Harbor Tugs, Little, YLT had a displacement 70 tons lite, 80 tons full, a length of 66 feet, a beam of 18 feet, a draft of 4 feet 11 inches, a crew of 4, no armament, and diesel engine with a single propeller with 300shp. A Type V ship.
Madden and Lewis built Harbour Defence Motor Launch (HDML) were built for the US Navy, but all four went to the Royal New Zealand Navy (RNZN) for anti-submarine patrols.
HDML had a length of 76 feet, a beam of 16 feet a draft: 5 feet and a displacement of 54-tons. HDML had two engines. They had a crew of 10 men, armed with one 3 or 4 pounder gun and four .303 AA guns. Had a top speed of 11 knots.