Question 481Navigation General

The correct answer is C) -..-..-..-..- This symbol represents a 20-fathom curve on nautical charts. A fathom is a unit of measurement equal to 6 feet, so a 20-fathom curve indicates a depth of 120 feet. This symbol is the standard representation for 20-fathom depth contours on US Coast Guard charts, as per the established charting conventions. The other options are incorrect because they do not match the standard symbol used for 20-fathom curves. Option A and B use dashed lines, which could represent other depth contours, while option D uses a more complex symbol that does not match the 20-fathom standard.