ok i focused on the bridge aspect, in current try to go to the inside of the curve, the outside is where the current is faster. sailing on the inside of the bend in the current is faster, you have to choose the fastest way to the other side when you get to the point. short tacking out of the current in the eddy side of a point is good. pick a fast line to the other side when you sail past the point, get over there as fast as possible and short tack that side. the inside of the bend has less current until you get to the point.