Question 1377Navigation General

The correct answer is C) 50 feet (15.3 meters). To calculate the depth of the water beneath the keel, we need to add the draft of the vessel (7.0 feet or 2.1 meters) and the height of the tide (+3.0 feet or 0.9 meters), and then subtract this total from the charted depth of 9 fathoms. 9 fathoms is equivalent to 54 feet (16.5 meters), and when we subtract the draft (7.0 feet) and the height of the tide (+3.0 feet), the result is 50 feet (15.3 meters) - which is the depth of the water beneath the keel. The other options are incorrect because they do not accurately calculate the depth based on the given information.