Area. All of the waters upstream of a line beginning at a point, at or near Lat. 38° 1.707' N., Long. 75° 49.512' W., then running 35° to a point, at or near Lat. 38° 1.814' N., Long. 75° 49.418' W. The speed limit for the area described in §A of this regulation is 6 knots on Saturdays, Sundays, and State holidays during the boating season.