During "my time" as a Nav, who was usually a 2/O, he was responsible for the upkeep of all Navigational publications. Some of these such as "Light Lists" were farmed out to (say) the3/O. In the days of pen and ink this was a massive task. But in the "commercail" world the poor 2/O wouldn't have to endure the torture of being "investigated" by the Portland "Auditors", when every dot and comma was perused. I really can't over-emphasise how onerous this job of maintaining perhaps 5,000 charts was. The USN had a better idea, and that was to appoint a "Navigators Yeoman" who would spend his days "maintaining the paperwork". Good...up to a point. Although it was a really lousy job it did actually teach you an awful lot about the nooks and crannies of the world. Similarly, the advent of electronic charts makes the job easier, but at the expense of the Navs knowledge of geography...and that knowledge is hard earned, but vital. Swings and roundabouts I suppose. The monthly (?) issue of the "Admiralty Notices To Mariners" was usually (and still is) about 50 pages thick of small print (no adverts).
I see you're from my neck of the woods...care to send me an e-mail via my address that's under the "profile button"...we may have some stuff in common. Regards, Bryan Young.