I have no idea what anchors or length of chain Legacy had, but many 50 meter yachts has 2 x 200 meter chain. 100 meter is what you find on 25 meter yachts.
So the industry standards is chain lenght based on yacht lenght?
The kind of boats I deal with these days, sailboats 35 to 40 feet usually sport 33 meter chain spliced to 66 meter 3/4 inch 3 strand nylon.
The offshore/around the world guys sometimes have 100 meters of chain...3/8 inch or 5/16 High Test (G4)
Every boat is different however depending on the owner and how good he wants to sleep at night.
Just curious if the big yachts have a set standard..Or is it up to the designer, or the owner or the yard or whatever.?
Again, this is a subject that interest me as I almost lost my boat 21 years ago due to inadequate anchoring gear and my inexperience:
Dragging towards the rocks in Lindbergh Bay in St. Thomas in a gale and could not get the engine started due to bad batteries...Had one and only one shot disconnecting the battery cables and cleaning corrosion of the terminals while the boat was dragging up on the rocks..
The engine started last minutte and we motored out of there on a wing and a prayer..