with respect jim i have shot in mind for the answer to the chain length question.please can you tell me where ican confirm this as i can,t find it anywhere.thanks in advance,skybluefred.
shot [2] another name for a shackle as unit of length for anchor chains. In this use, common in the U.S., a shot equals 15 fathoms, 90 feet or 27.432 meters. The origin of this name for a length of chain is not certain. It may be a corruption of "shut," since anchor chains are formed by shutting clasps or shackles to join shorter lengths of chain.
I usually go to Google and type any word or phrase,definition and it will usually come up with a variety of options. That's how I found SHOT. If you ask for a definition in this way, there's a good chance you will find your answer.