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PREFACELAKE SURVEY ORGANIZATION AND DUTIES
CONVERSION TABLECOMPASS POINTS TO AZIMUTH
SIGNALS FOR THE OPENING OF DRAWBRIDGES
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18 feet 21 feet anchorage approach black lighted black spar buoy boats breakwater bridge Canadian canal Chicago Clair River Coast chart craft crib deep water Detroit River diaphone diaphone sounds blast distance draw dredged Duluth east side easterly eclipse 3.6 seconds entrance channel extends feet feet deep feet depth feet long feet of water feet wide fixed red fixed white flash 0.5 second float front light harbor master Highway Huron inner end Island Light Keweenaw Waterway Lake Huron Lake Michigan Lake Ontario Lake Superior least depth located lock low-water datum marked Marys River miles long moored mouth navigation Niagara River northeast northeasterly northerly obstruction opening outer end passage Port Railway red flash Reef regulations revetment River Rock shoal shore line showing a white southeast southerly southwest Street Sturgeon Bay thence turning basin vessel visible 13 miles west pier west side westerly wharf white flash width