Anchored in a open south facing cove ; tidal current runs east/west,
wind was from the SW. Anchored 4 hours before low, boat drifted east on
anchor line , bow toward anchor as it should be .

As slack approached, aft of boat started to swing back towards the anchor
, irrespective of wind and remaining east flowing current; had I not moved
the boat it would have wrapped the line around my rudder.

Last week at this spot I woke up to find line between my keel and rudder; I
thought it had happened with no tension on the line at slack , but in this
case the boat was still hard on the line back west to the anchor. I am
completely at a loss to explain this . some odd eddy in this cove ? Boat is
fin keel Pearson. Setting a partial main helped some, but I had to run the
engine in forward to bring the bow towards the anchor ...