These are just a few sites related to the PotC time period. Actually, most of them are late 1700's to early 1800's, but they should still be useful.
Royal Navy 1700's-1800's
Kissing the Gunner's Daughter:United Kingdom - Naval Discipline for Boys
http://www.corpun.com/kiss1.htm King's College's Royal Navy History Page
It's mostly late 18th century to early 19th century. Links to more pages are at the bottom.
http://www.kcl.ac.uk/depsta/iss/library/speccoll/exhibitions/skilsail/navies.html Empire and Sea Power
http://www.bbc.co.uk/history/british/empire_seapower/ Life At Sea in the Royal Navy of the 18th Century
http://www.bbc.co.uk/history/british/empire_seapower/life_at_sea_01.shtml Women in Nelson's Navy
http://www.bbc.co.uk/history/british/empire_seapower/women_nelson_navy_01.shtml The Rise of the Royal Navy 1660-1815
http://www.royal-navy.mod.uk/server/show/nav.3848 Hand Salute
I didn't know Britain saluted differently! (I'm in the US, by the way.)
http://en.allexperts.com/q/Military-History-669/Hand-Salute.htm?zIr=5 18th Century
A Meal From the 1780's: Not for Diet Watchers
The link is absurdly long 18th Century Etiquette
http://www.ladiesofreenacting.com/Colonialmanners.html University of Michigan's 18th Century England
They have a wide variety of topics and since these were student projects the information is cited.
http://www.umich.edu/~ece/showcase/index.html Dress Up-Clothing From the Past
http://www.memorialhall.mass.edu/activities/dressup/index.html Colonial Williamsburg Introduction to 18th Century Clothing
http://www.history.org/history/clothing/intro/index.cfm Miscellaneous
Daughters of the Sea
Water maidens, goddesses and women of the sea are the focus of this site.
http://www.fionaurora.com/sea/seaindex.htm Elizabethan Card Games
Okay, so this is a bit early, but it's possible versions of these were still around in the 18th century...
http://jan.ucc.nau.edu/~wew/Tattershall-tb/cards.html