US COAST GUARD RESERVATION AREA The U.S. Coast Guard Reservation boundary line coincides with the Mean High Water line at these positions: From approximately 57°44'02"N/152°31'14"W in a southerly direction to 57°41'41"N/152°32'22"W From approximately 57°43'24"N/152°28'44"W in an easterly direction to 57°43'36"N/152°26'50"W. From approximately 57°42'51"N/152°28'10"W in a southerly direction to the chart edge.