In Britain, it means diddly. It means you're a male, presumably respectable. If you have no other title, then the overly-British will put esq. after your name on an envelope, etc. In America, I believe it's sometimes used after a lawyer's surname. However, I don't see it used much by U.S. lawyers.
Davit systems are most often used to lower an emergency lifeboat to the embarkation level to be boarded. Davits can also be used as man-overboard safety devices to retrieve personnel from the water. The lifeboat davit has falls (now made of wire, historically of manila rope) that are used to lower the lifeboat into the water.
Technical Info: How Inflatable Life Jackets Work. How inflatable lifejackets work. Automatic lifejackets activate when detecting water. Upon detection of water, a firing. mechanism will activate and pierce a CO2 cylinder. The air coming out of the cylinder will. inflate the bladder of the lifejacket and create buoyancy.