🔍 Key Concepts

• Using the chart to measure the true course from Chesapeake Light to North Chesapeake Entrance Lighted Whistle Buoy NCA • Converting true course → magnetic course → compass course (psc) using variation and deviation from the compass rose and deviation table • Remembering that the course is plotted from Chesapeake Light TO buoy NCA, not the other way around

💭 Think About

• When you plot the line from Chesapeake Light to Buoy NCA, is your measured true course closer to the low 320s or mid‑310s? • After you find the true course, what signs (east/west) are the variation and deviation, and do they make the compass course larger or smaller than the true course? • If you carefully apply the TVMDC (True‑Variation‑Magnetic‑Deviation‑Compass) steps, which of the four options is closest to your final compass value?

✅ Before You Answer

• Verify you are measuring FROM Chesapeake Light TO Buoy NCA, not the reverse • Double‑check the variation value and year, and apply the correct annual change if indicated on the chart • Confirm the deviation used corresponds to the nearest heading in the deviation table and that you applied the correct sign (add or subtract) before choosing your answer