Contemporary newspapers also report some printing activity onboard ship:
It was reported that when Napoleon landed in Egypt in 1798, he issued a series of printed proclamations on his arrival, which had been “ … composed and printed on l’Orient during the passage from Malta to Alexandria”
[https://www.britishnewspaperarchive.co.uk/: Kentish Gazette 5 Oct 1798]
Sir Sydney Smith (who had a press onboard his flagship in the Med.) had one earlier –
“Sir Sydney Smith has given orders for erecting a printing press on board his ship, the Antelope, now lying in Dover roads”
[https://www.britishnewspaperarchive.co.uk/: Hampshire Chronicle 4 Nov 1805]
Somewhat later, in 1843, it was reported that HMS Belleisle had a printing press onboard, set up and operated by an army officer, Capt. Edie of the 98th Regiment, who happened to be onboard
[https://www.britishnewspaperarchive.co.uk/: Halifax Guardian 2 Sep 1843]
The various Arctic expeditions of the 1840s and 1850s are reported to have the ability for simple printing – playbills and newssheets etc – for the crew