Ships are usually pretty sane, at least y military standards. Officers' mail tends to be addressed to the wardroom (the Naval equivalent of the Officer's Mess).

Ships are usually pretty sane, at least y military standards. Officers' mail tends to be addressed to the wardroom (the Naval equivalent of the Officer's Mess). Other ranks' mail goes to their mess, which is generally designated by bulkhead number and port/starboard. (Rank s, of course, optional, and not expected on civvy mail.) The "street" is the ship's name, city is the home station (and where the mail is sorted and dispatched) and there is usually a separate postal code for each ship. So, for a fictional Canadian Able Seaman: Ralph Rackstraw 19 Starboard, HMCS Pinafore, CFB Halifax, NS (, CANADA - optional) X1X 1X1 The system in Oz at least used to be similar. Which is great if you're actually posted to a vessel. That isn't always the case in Canada; we air types, the folks what flies and fixes the helicopters, are nominally "Air Force" and are seconded to ships for voyages only, remaining on squadron strength back at our home airfield, so unless one is vigilant about changing addresses every few weeks, important mail may be headed to your post box at the barracks while you're at see and to the ship while you're at home.