<Snipped quote by TheIratePirate>
Oh, oh. I see! That's good to know, thanks. So midshipmen, if I'm getting this right, would usually be boys/men of a higher social class than, say, an ordinary seaman?
The Royal Navy never was -quite- as aristocratic as the army, in which one might simply buy a commission if one had money. Navy officers needed specific training for which a specific inclination and talent was particularly prized, no matter how blue your blood was, tho it might incur you preferential treatment, not guarantee you a command. You did need to pass the examination for lieutenant before a board of captains to become an officer, and that could not be bought. Captains also had the freedom to take on whomever they pleased on as midshipmen. There was a clear incentive to taking on those who had letters (incurring favor with those up the chain of command to make Post, for example), but a less fortunate Captain, say one that might have a few debts might take one as a personal favor, or might take his own child, or the child of a career seaman as form of recognition and thanks for his service.