"Wayne.B" wrote

wind speed, wind angle, boat heading and boat speed through the water

Did you mean "speed over the ground:"?

Not sure how it helps to know a measured-log calculation of 10kts when the
tide and current might be holding you to 5kts over the ground ;-) If you
know your boat's hull speed under various sails and points off the wind you
could estimate current from speed (vector) over the ground, but not the
other way around given only speed through the water, which would include an
unknown vector of current direction.

Jack