🔍 Key Concepts

• Plotting a course between two positions on a standard NOAA training chart that includes Saybrook Breakwater Light • Understanding the relationship between true course, variation, deviation, and compass course (psc) • Interpreting what "5 miles due south" of an aid to navigation means on a chart (latitude/longitude changes)

💭 Think About

• How do you find the latitude/longitude of a point that is exactly 5 NM due south of Saybrook Breakwater Light using the chart scale? • Once you have the true course from your present position to that point, how do you apply local variation and the vessel’s deviation table to convert to a standard magnetic compass course? • When moving due south or nearly north–south, which coordinate (latitude or longitude) changes most directly, and how does that affect your plotting?

✅ Before You Answer

• Verify the exact charted position of Saybrook Breakwater Light and then carefully construct the point 5 NM due south using the latitude scale. • Double-check that you’ve used the correct variation for the chart area and the correct deviation for the heading range from the deviation table provided on the exam chart or in the problem. • Confirm that your final answer is expressed as psc (per standard compass), not true or magnetic, and that it’s consistent with the expected direction of travel on the chart.