Ancestors in the Royal Navy
If you are lucky, you may have the original of your relative's Certificate of Service (often on Form S 1243) which will list ship's they served in, when they did so, courses attended etc.
NA Registers of Seamen's Services will let you find an extract of their Certificate of Service, again listing ships served on, courses, date and place of birth etc etc. The records seem to cover the period from about 1840 through to 1900. See the RN Certificates Of Service page for an example.
If they served in the Merchant Navy in WW2, the Seamen's Medal Rolls are also online.
If you know which ship they were on, you may wish to contact the "old boys" sites for more information. A Google search will often throw these up.
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