It is possible, but I'm guessing you'd have to do most of the development work yourself. Good station-keeping, as in drilling rigs and research vessels, is done with a thruster on each quarter. Not a very good solution for a sailboat. Another way would be a single azi-pod mounted near the center of the boat. It would turn to face away from the direction of drift, and the thrust until it returns to station.
I like the idea of anchor line strain gages, but the OP seemed to say he wanted an anchor-less solution.
--- In electricboats@yahoogroups.com, "leemurs72" <jt.yahoo@...> wrote:
>
> What you are looking for is called "station keeping" in autopilot speak. http://www.yachtingmagazine.com/article/Best-New-Autopilots has some tidbits on various autopilots. The ComNAV autopilots have station keeping abilities, but I think that requires a bow thruster...
>
> I am sure you could spoof a stay-put request by feeding a tight circle of waypoints to your autopilot over and over again. Of course, your anchorage neighbours would not be too pleased.
>
> How about adding a strain gauge to the anchor line feeding info to
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