While entering a harbor on a course of 225°...

Study

Question 1 of 2066636ee928f7522a1c5196ab

While entering a harbor on a course of 225° per gyrocompass, you take a bearing on a pair of range lights and get 220° per gyrocompass. The bearing on the chart is 217°T. The variation for the area is 6°W, and deviation is 2°W. What course would you steer per gyrocompass to make good a true course of 232°?

Back

Question 1 of 20

66636ee928f7522a1c5196ab

No comments yet

Be the first to share your thoughts!

If the question has a related picture, it will appear here.

🔍 Key Concepts

• Gyro error and how to find it using a known true bearing and a gyro bearing • The relationship between True (T), Magnetic (M), Compass (C), and Gyro (G) courses • Applying variation and deviation with correct algebraic signs (East vs West)

💭 Think About

• From the range lights, first figure out the actual gyro error using the true bearing and the gyro bearing you observed. • Convert the desired true course (232°T) to a gyro course using the same error you just found. • As you convert, keep track of whether you are moving from T→G or G→T and whether you should add or subtract each correction.

✅ Before You Answer

• Verify that you are using the correct sign convention: West is best, East is least when going between True and Magnetic. • Check that you are consistent: apply variation and deviation only when moving between True, Magnetic, and Compass, and apply gyro error when moving between True and Gyro. • Before picking an answer, recompute the chain both ways (from True to Gyro and back) to confirm you get the original values within 1°.

👋 Hi! I'm Genie, your AI study assistant. How can I help you with this question?

Quick actions

— No credit card needed