The Grays Harbor pilotage district shall have an outer boundary line between Grays Harbor and Willapa Harbor and the high seas which shall be seaward of a line from Point Brown rear range light to Grays Harbor entrance lighted whistle buoy number three, (latitude N 46-55.00, longitude 124-14.42 W), thence to Grays Harbor entrance lighted whistle buoy number two (latitude N 46-52.43, longitude 124-12.35 W), thence to Grays Harbor light and from the Willapa Bay light to the Willapa Bay approach lighted whistle buoy "W" (latitude N 46-41.50, longitude 124-10.46 W), thence to the charted northernmost position of Leadbetter Point.