🔍 Key Concepts

• Standard magnetic compass (psc) vs true bearings and how to convert using variation and deviation • Three-bearing fix using lines of position (LOPs) on the chart • How to visually compare where the three LOPs cross with the answer choices’ positions

💭 Think About

• First, think about how you will convert each psc bearing to a true bearing using the information in the chart margin and compass rose for that area. • After plotting your three true bearings from the charted lights, look at the triangle of error: where is the most reasonable center of that triangle relative to nearby landmarks and depth contours? • Once you have an approximate fix on the chart, which latitude and longitude choice lies closest to that plotted position?

✅ Before You Answer

• Make sure you are using the correct variation and deviation for the standard magnetic compass (psc) in the exam’s plotting sheet/chart legend. • Double-check that each bearing is from the ship to the light, and that you are plotting the correct reciprocal as a line of position from the light toward your vessel. • After plotting, verify that your chosen answer’s latitude and longitude place you near the intersection of all three LOPs and consistent with your course 083° psc track.