I "think" they are talking about a 2nd anchor. Which you should have on board.Extra line, yes. Extra chain no.
I highly suggest a windless. With out one, I would suggest ether a cam cleat or clam cleat. In rough waters, when the bow goes down, pull the line/rode up. With the rode in the cleat, as the boat goes up the cleat will take the load. Not you, which would try to pull you over the bow.I forgot, but it really did not seem to be all that much, considering the job it does. Trying to retrieve 100 ft of anchor road in 2 ft waves is no fun at any age. It has made boating and anchoring posible and safer for me. When I get over to visit with my girl, I check it out and let you know.