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Would love to hear an expert talk be about this more. It's an interesting idea, but seems like it would be limited in usefulness to small adjustments.
As a sailboat enthusiast kedging is most often used as in the case of poor Blackbeard when you get caught up on something and need to move a small bit in a direction that's against the wind or water. So usually just trying to get unstuck when you've run afoul of hidden sand bars or the tide shift leaves you in an awkward spot. You also might do it to help set an extra anchor if you're worried about drifting on the tides.
Even deep water boats only have a few hundred feet of anchor rode and line and it takes a while and is a hassle to kedge out with your dinghy.
I have never in all my years of boating seen anyone do it as a method of general propulsion outside of just handling lines at the dock. It's just sometimes your best shot.
I had no idea this had a name! When I was a small child we lived by the coast and my dad had a small yacht, one day I remember the keel lodged on a sandbar and he used the anchor to pull it free. Unfortunately we moved inland when I was 5 and dad sold the yacht.
Yeah me too. I tried searching around but it's hard to find something that's not sci-fi related about this topic. It might also be called "kledging" from what I read, but not sure if that's the exact same thing.
I stumbled on it when figuring out just how the hell tall ships docked and undocked without tugs. Turns out they did use tugs in the form of rowboats but they also extensively used shoreside rigging and warping.
Edit: and I should add, they very rarely actually docked in the first place because it was such a pain in the ass, so they used tenders instead mostly
This also bugs me in movies whenever someone is kicked off the boat, but they're given a small rowboat and some provisions. Like, that wasn't an extra boat. It serves a purpose on the ship, and everything that takes up space on a boat is precious. A "spare" rowboat could be the difference between life and a horrible death. It could be months before they find a port where they can buy a replacement rowboat.
I guess it would be valuable in shallow water, less useful in the deep ocean, and overall better than being stuck in one place!