The Harbours Act

rackham cay on one side and by the line joining harbour shoal buoy and west middle rock buoy on the other side; or near fort augusta within the channel between the line joining two sisters beacon and burial ground beacon on one side and by a line joining

The Harbours Act

rackham cay. no vessel shall proceed through the ship channel off fort augusta in either direction if the length of the tow between any vessels being towed exceeds five hundred feet, or the total length of a tow measuring from the bow of the vessel towing