Sorry to be naive Robert but I would suggest the opposite (as I usually
do:-))

You do want to be told when the wind or tide etc swing you round the
other way, that's when the anchor is most likely to pop out.

Once you're sure the anchor has reset itself etc then you can reset the
anchor watch for the new position & relax.


To have to reset the anchor watch at every wind or tide shift is what I
want to avoid. I want the anchor watch to call me only if the anchor drags.
If I can position the center of the circle to were to the anchor is, the
anchor watch will call me only when the anchor actually drags.