I use 10 foot, 5 foot of 5/16 with a 5 foot extension of 1/4. This is relative to the boat you are in, in my Astro I used the set up described when it was really bad, most of the time 2 ropes out with 5 foot of 5/16 chain was plenty. In my BassCat I need at least what I described most of the time, wider bigger boat drifts more. Tin boat will need more because it sits higher and catches more wind, trial and error and figure out what fits your ride.