I've seen the anchor used to berth something bigger. (Three-masted Barque, 55metres, 500tonnes). She came in to a dead-end basin, dropped the hook in the middle of it and swung round it in to the berth. Nearest thing to a handbrake turn with a ship that I have seen.To get out, warp the bow out on the anchor and motor ahead. A competent Master, he made it look so easy /forums/images/graemlins/grin.gif
I once used an anchor to hold the bow against an onshore breeze when berthing Invincible (aircraft carrier 24,000 tons) in Barbados. Had to resort to extreme seamanship because the tug would not play. Not really a marina, but same principle and worked - just like it says in ST, which was a good article for those who already know what they are about.
You'll still see the Caledonian-Macbraynes ships using a bow anchor to help control their downwind berthing, when it's blowing a hooligan from the NW into Oban Bay and onto the ferry pier.
Some 'marinas' in the S Pacific often have cyclone moorings which are a huge buoy in the centre of basin and all the yachts tie their bowlines to it with their sterns aghainst the wall or piles. Formation looks like spokes of a wheel. Not anchoring strictly speaking but same principle.
what sort of tackle do they have underwater to make that work? Must be a fairly major piece of engineering to hold that many boats in a wind of that strength?