Anchor Scope Nomograph

How Much Scope to Lay at Anchor

You probably know the rules of thumb. Something like 7:1 scope if you’re staying overnight, 5:1 if you’re just there for a few hours. But where do these rules come from, and what if you can’t lay that much scope – say you’re up against the shore line, or the swing radius is too big. I took an engineering approach to calculate what scope you actually need, depending on the relevant variables.