PY – Patrol Yacht
 
  PY Aileen      
  PY Dorothea      
  PY Eagle      
  PY Frolic      
  PY Gloucester      
  PY Hist      
  PY Hornet      
  PY Sylvia      
  PY Yankton      
  PY Wasp      
PY-1 Mayflower 1898 1929  
PY-2 Hawk 1898 1919  
PY-3 Scorpion 1898 1927  
PY-4 Vixen 1898 1922  
PY-5 Sylph      
PY-6 Nokomis 1917    
PY-7 Aramis 1917 1921  
  PY-8 Despatch      
PY-9 Niagara 1917    
PY-10 Isabel 1917 1946  
  PY-11 Wenonah      
PY-12 Sylph      
PY-13 Siren 1940 1944  
PY-14 Argus 1941 1946  
  PY-15 Coral      
PY-16 Zircon 1941 1946  
  PY-17 Jade      
PY-18 Turquoise 1941 1944 mod. PC-459 Class
PY-19 Carnelian 1941 1946  
PY-22 Azurlite      
  PY-23 Beryl      
  PY-24 Almandite      
PY-25 Crystal      
PY-26 Cythera      
PY-27 Girasol 1942 1946   
PY-28 Marcasite 1942 1944  
PY-29 Mizpah 1942 1946  
PY-30 Hydrographer - -  
  PY-31 Cythera      
PY-32 Southern Seas      

PYc – Patrol Yacht, coastal
 
  PYc Free Lance      
  PYc Inca      
  PYc Oneida      
  PYc Siren      
  PYc Viking      
  PYc-1 Emerald      
PYc-2 Sapphire 1941 1945  
PYc-3 Amethyst 1941 1946  
PYc-4 Agate 1941 1944 mod. AM-78 Goldcrest
  PYc-5 Onyx      
PYc-6 Amber 1941 1944  
  PYc-7 Aquamarine      
PYc-8 Opal 1941 1943  
  PYc-9 Moonstone      
  PYc-10 Topaz      
PYc-11 Andradite 1942 1945  
  PYc-12 Sardonyx      
  PYc-13 Jasper      
  PYc-14 Truant      
  PYc-15 Garnet      
PYc-16 Chalcedony 1942 1946  
  PYc-17 Pyrope      
  PYc-18 Peridot      
  PYc-19 Rhodolite      
  PYc-20 Jet      
PYc-21 Alabaster      
  PYc-22 Olivin      
  PYc-23 Sard - -  
  PYc-24 Iolite - -  
  PYc-25 Phenakite      
PYc-26 Cymophane 1942 1944  
  PYc-27 Colleen      
PYc-28 Ability 1942 1944  
  PYc-29 Gallant      
  PYc-30 Vagrant     mod. YP-258 Class
  PYc-31 Lash      
  PYc-32 Tourist - -  
  PYc-33 Palace - -  
  PYc-34 Brave - -  
PYc-35 Felicia      
PYc-36 Paragon 1942 1944  
PYc-37 Mentor      
PYc-38 Carolita 1942 1944  
  PYc-39 Marnell      
PYc-40 Captor 1942 1944 mod. AM-132 Eagle Class
  PYc-41 Iolite      
PYc-42 Leader      
  PYc-43 Sea Scout      
PYc-44 Perseverance     mod. USCGS Bedford
PYc-45 Black Douglas     mod. IX-55 Black Douglas Class
PYc-46 Impetuous     mod. PC-454 Class
PYc-47 Patriot 1943 1944 mod. PC-455 Class
  PYc-48 Persistent     mod. PC-456 Class
PYc-49 Retort 1943 1944 mod. PC-458 Class
PYc-50 Sturdy     mod. PC-460 Class
PYc-51 Valiant     mod. PC-509 Class
  PYc-52 Venture     mod. PC-826 Class