MAINTAINED CHANNELS The dredged channels in the approaches to Port Muhammad Bin Qasim (Ahsan Channel and Phitti Creek) are liable to silting during the SW Monsoon; the position of the channels may vary accordingly. The depths are maintained as required. In addition, buoys are liable to drag and their charted positions should not be relied upon. For the latest information and details of maximum permissible draughts/dimemsions for ships using the channels, Notices to Mariners and Navigational Warnings, issued by the Pakistan Navy, should be consulted.