On the flip side, we pulled into a very well protected bay and anchored about 250 feet (by radar) from the closest vessel. Because we were in 20' I put out 60' of chain and relaxed.
Shortly after while I was out for a row the owner of the boat 200' feet away called me over and informed me I was too close and could I move further away? Um, okay, but how much did he have out? 120' he said, and while I tried to suggest he didn't really need that in a very protected bay in 20', he didn't budge. So we moved, which wasn't a big deal, but kind of annoying nonetheless.
The next morning when he pulled up his anchor, I understood. His 31' trawler had at best a 10 lb Danforth.