The following questions are based on Chart...

Question 1 / 2066636eea28f7522a1c51b25d

Question 1 of 2066636eea28f7522a1c51b25d

DEVIATION TABLE Magnetic Heading Deviation 000° 1.5° 030° 2.0° 060° 1.0° 090° 0° 120° 1.0° 150° 1.5° 180° 2.5° 210° 1.5° 240° 1.0° 270° 0.5° 300° 0° 330° 0.5°

E On 31 July, you are anchored at LAT 37° 22.4' N, LONG 75° 39.9' W. You get underway at 0240 enroute to Yorktown, VA. What is the course psc from the anchorage to point A located 0.5 mile east of Cape Charles Lighted Bell Buoy 14?

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Question 1 of 20

66636eea28f7522a1c51b25d

DEVIATION TABLE Magnetic Heading Deviation 000° 1.5° 030° 2.0° 060° 1.0° 090° 0° 120° 1.0° 150° 1.5° 180° 2.5° 210° 1.5° 240° 1.0° 270° 0.5° 300° 0° 330° 0.5°

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🔍 Key Concepts

• Converting between true, magnetic, and compass (psc) courses using variation and deviation • How to use the deviation table correctly based on the magnetic heading, not the compass heading • Plotting the course from the anchorage position to a point 0.5 NM east of Cape Charles Lighted Bell Buoy 14 on Chart 12221TR

💭 Think About

• First, on the chart, carefully plot the position of the anchorage and the point 0.5 NM east of Buoy 14, then measure the true course from the anchorage to that point. What approximate true course do you get? • Once you have the true course, think through the order of applying variation and deviation to end up with a course per standard compass (psc). Are you going from true to compass, or compass to true? • Look at the deviation table: you must enter it with the magnetic heading. After applying variation to your true course, what is the closest magnetic heading, and what deviation value does that give you?

✅ Before You Answer

• Be sure you’re applying variation 10° W with the correct sign when going from true to magnetic (remember the standard memory aids, like "East is least, West is best" or "Can Dead Men Vote Twice At Elections"). • Confirm you used the magnetic course (after applying variation) when entering the deviation table, not the compass course. • After converting to a compass course, compare your result to the answer choices and check which one is closest to your calculated psc, considering possible small plotting/measuring errors.

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Question 1 of 20

The following questions are based on Chart 12221TR, Chesapeake Bay Entrance, and the supporting publications. The draft of your vessel is 9.0 feet (2.75 meters) Gyro error is 2° W Variation is 10° W "Per standard magnetic compass" is abbreviated "psc" "Per gyrocompass" is abbreviated "pgc" DEVIATION TABLE Magnetic Heading Deviation 000° 1.5° 030° 2.0° 060° 1.0° 090° 0° 120° 1.0° 150° 1.5° 180° 2.5° 210° 1.5° 240° 1.0° 270° 0.5° 300° 0° 330° 0.5° E On 31 July, you are anchored at LAT 37° 22.4' N, LONG 75° 39.9' W. You get underway at 0240 enroute to Yorktown, VA. What is the course psc from the anchorage to point A located 0.5 mile east of Cape Charles Lighted Bell Buoy 14?

187° psc

180° psc

194° psc

Question 1 / 2066636eea28f7522a1c51b25d

Question 1 of 2066636eea28f7522a1c51b25d

DEVIATION TABLE Magnetic Heading Deviation 000° 1.5° 030° 2.0° 060° 1.0° 090° 0° 120° 1.0° 150° 1.5° 180° 2.5° 210° 1.5° 240° 1.0° 270° 0.5° 300° 0° 330° 0.5°

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Question 1 of 20

66636eea28f7522a1c51b25d

DEVIATION TABLE Magnetic Heading Deviation 000° 1.5° 030° 2.0° 060° 1.0° 090° 0° 120° 1.0° 150° 1.5° 180° 2.5° 210° 1.5° 240° 1.0° 270° 0.5° 300° 0° 330° 0.5°

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🔍 Key Concepts

💭 Think About

✅ Before You Answer

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