Sail or Power?
If under sail, I like to furl the main and use the jib only, just let the jib all the way out early to slow down, but without an engine in reverse you must head into the wind to stop the boat.If you were under power only, do you have an outboard? If so it sounds like the propeller is not far enough down in the water to provide enough thrust. You may want to do a u-turn into the wind just outside the marina entrance, using the wind to slow you down then head down wind and go into reverse very early!Hope this helps...Charles Duhon"Artistry"