Liverpool & South West Lancashire FHS - Forum

Thanks to Tony Hennessey for this tip.

Available on Ancestry, maybe other sites also.
Either use the drop down "County" box or scroll down to the list of counties at the bottom of the page and you will be able to choose

"Royal Navy" for the years 1861, 1871, 1881 and 1891 or
"Misc Ships at Sea or Abroad" for 1861.

Also, for those with the LDS discs of the 1881 census there is a section in the Scotland Region (Lowlands) for 'Royal Navy (Scotland)', though I have never had cause to look at it.
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Additionally, click on the county as normal, e.g. Lancashire, then choose "Vessels" as the district