I can think of lots of reasons to anchor 2 or 3 miles off shore. Watching air shows, major fireworks displays, diving, fishing to name just a few. 3-4 foot seas might be a bit nauseating at anchor, but it can certainly be done.
Some things I would watch out for? Put out lots of scope
, depending where you are, it might only be 30 feet 3 miles off shore, lots of boats are set up with 300' of rode
, so it should be possible.
Check to make sure your hard points, cleats
or whatever it is you make your anchor off to are up to the task. For example, if you have small deck cleats
with no backing, you could easily wind up peeling open your deck
or breaking the cleats.
If your windlass
is on the lower end of the power scale, heaving in that 300' might be a time and power consuming proposition, because you might only be able to heave when the boat is moving down, avoid heaving on the up if you can.
Have your bow person tether themselves and put on a life jacket for shipping
the anchor, or at least I would.
keels will certainly dampen the roll in a sea, that's what they're for, but I think it might still be a pukey ride in a 28 foot boat, just the pitching and heaving might be uncomfortable even assuming you can manage the roll.
I would avoid trying to sail off the anchor in those conditions, too many force vectors to be concerned about, use your engine
, if it'll start.
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