The COLREGS are the foundation of understanding for all bridge watch officers. There are classes that teach it. Countless books that break down all the various rules and apply them to as many scenarios that one could possibly encounter underway. Every license exam requires you to take a rules of the road test. I’ve memorized the book in the past. I say I have an excellent working knowledge of the rules, but like all books you don’t retain the information indefinitely unless you have an eidetic memory. One of my Chiefs had us sign a statement stating we’d read nav rules prior to every deployment. I guess my point is that unless you are an idiot and skate by on the bare minimum, sure…only read it when you have to take a test. Sit up on watch staring at your phone. Personal preference. I don’t “need” it to be up there to prevent having a collision, but I carry it with me to keep it fresh in my mind. So it seems that since you don’t have a clue what it takes to stand a good watch in the wheelhouse, maybe before you start mocking people, ask some intelligent questions first or just not say anything at all.