In order to increase realism and historical coherence to the game, I suggest to assign ship permits only for its historic nation. This would increase interest for each nation, to try them all, and let the player choose their level of difficulty. That won't prevent each nation to capture ships to the opposing nations, or find note if it needed exotic ships.
Thank you for your attention.
France :
L'Océan, Le Bucentaure, Implacable, La Belle-Poule, La Renommée, Le Gros Ventre
Spain :
Santisima Trinidad, Diana
England :
Victory, Bellona, Agamemnon, Indefatigable, Leopard, Cerberus, Endymion, Indiaman, Santa Cecilia, Surprise, Trincomalee, Roukie Snow, Snow, Pickle
Danmark :
Christian VII
Russia :
St Pavel, Ingermanland, Frigate, Mercury
Sweden :
Wasa
Netherlands :
Admiraal de Ruyter, Indiaman, Yatch
USA :
USS Constitution, USS United-States, Essex, Niagara, Prince de Neufchâtel, Rattlesnake, Rattlesnake Heavy, Brig, Navy Brig, Lynx
Prussia :
Wappen von Hamburg
Pirates :
Pirate Frigate
For all nations :
3rd rate, Redoutable, Leopard, Rattvisan, Hercule, L'Hermione, Pandora, Le Requin, Mortar Brig, Trader Brig, Trader Snow, Basic Cutter, Cutter, Gun Boat, Privateer, Trader cutter, Trader Lynx