Question 2000Navigation General

The correct answer is B) all low waters. Mean low water is the average height of all low waters, which is the average of the lower of the two daily low tides. This is the accepted definition of mean low water as per the US Coast Guard regulations for Captain's License Examinations. The other options are incorrect because: A) High and low waters are two separate measurements, and mean low water only considers the low waters. C) Mean low water is the average of all low waters, not just the lower of the two daily low tides. D) Mean low water is a specific measurement of water height, not the general surface of the sea.