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Dear Mr. Donato,
Thank you for contacting the History Hub.
A quick internet search shows that there have been five U.S. Navy ships named U.S.S. Decatur, all of which were named for Stephen Decatur (1779-1820) who was a commodore in the U.S. Navy. The first U.S.S. Decatur was not commissioned until 1840, and you can find a brief history of it here in the Dictionary of American Naval Fighting Ships, a multi-volume publication of the Department of the Navy. Since the dates of this ship are after the dates of the travel narrative of the H.M.S. Adventure and Beagle, it seems that the John Myers you are interested in could not have sailed on this ship. A search of the Dictionary of American Naval Fighting Ships also shows that there was no ship named “Commodore Decatur.” Perhaps, though, John Myers sailed on a different U.S. naval ship under the command of Commodore Stephen Decatur.
The Textual Reference Branch at the National Archives in Washington, DC (Archives I) has custody of several series of naval records that may contain information on the John Myers you are researching. The series Muster Rolls and Payrolls for U.S. Navy Vessels, 1798-1860 and Muster Rolls and Payrolls for Shore Establishments, 1805-1869, for example, might include the information you are seeking. Both of these series are from National Archives Record Group 45: Naval Records Collection of the Office of Naval Records and Library [ONRL]. You can contact the Textual Reference Branch at Archives I directly at email@example.com with questions about these and other early 19th-century naval records.
Thank you, again, for sharing your question with the History Hub, and good luck with your ongoing research.