🔍 Key Concepts

• magnetic variation and compass deviation and how they affect courses • difference between true course, magnetic course, and compass course (psc) • using the charted channel centerline bearing and converting it to a steering course on the standard compass

💭 Think About

• Start from the chart: what is the true bearing of the York River Entrance Channel centerline in the direction you are traveling? • Convert that true course to a magnetic course using the local variation, then to a compass course using the given deviation table for the standard compass. • Ask yourself whether your final compass course should be higher or lower than the true course once you apply variation and deviation with the correct sign convention.

✅ Before You Answer

• Be sure you are using the correct sign for variation (east or west) and applying it in the correct order: True–Magnetic–Compass. • Verify that you are using per standard compass (psc) not gyro, and that any gyro information is not accidentally mixed into your calculation. • Double‑check that you are steering inbound down the channel (toward the river) and not using the outbound bearing by mistake.