From what I can understand, the modern ranking systems in the British Navy didn't come into effect until after the 17th Century. I'm trying to find out specifically the rank of a naval officer in charge of a land based structure, like a coastal fort. However, any information on naval rankings in general for the British (or even the other colonial naval powers) would be welcome as well.
I've written about ranks and manning a couple times before, though not specifically in the 17th century. I'm traveling and won't be able to consult my printed resources for a couple days, so ping me again later this week if this isn't satisfying.