Originally Posted by chriswood
I always make sure there's enough rope out so all the chains laying flat. Maybe overkill but never moved an inch.
That will work. The chain does not have to completely lie on the bottom, as long as, when the largest pulling force (from wind, current, swell or a combination thereof) is applied, the working end (at the anchor) is still laying horizontal.
The problem with having all the chain on the bottom is that you will increase wear on the rope from rocks and such. Not a big deal, but it is something that should be inspected now and again.