🔍 Key Concepts

• Converting compass (psc) bearings to true bearings using deviation and variation from the chart or exam reference • How to plot lines of position (LOPs) from multiple observed bearings to find a fix • Understanding how small changes in bearing affect the plotted intersection point and its latitude/longitude

💭 Think About

• What information do you need to convert a standard magnetic compass (psc) bearing to a true bearing before plotting on the chart? • Once you plot the three corrected bearings, how does the shape and tightness of their intersection help you judge which answer choice is reasonable? • If you slightly mis-plot one bearing, in which direction (N/S or E/W) does the fix tend to move between the listed answer choices?

✅ Before You Answer

• Verify you are applying compass → magnetic → true (or the reverse) in the correct direction and order • Check that all three LOPs actually cross near the entrance of the Chesapeake Bay and not unreasonably far from the lights • Confirm that your final fix aligns more closely in latitude OR longitude with one of the clustered answer choices, then look at which small change (0.1'–0.3') best matches your plotted point