Nav 1 Prelim B (20 Items)

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Quiz number 1

• 1.

True bearing 315 degrees, compass error 15 degrees East, variation 13 degrees East Find magnetic bearing

• A.

298 degrees

• B.

328 degrees

• C.

300 degrees

• D.

302 degrees

D. 302 degrees
Explanation
The true bearing is given as 315 degrees, which means the direction is 315 degrees clockwise from true north. The compass error is 15 degrees East, which means the compass needle points 15 degrees to the East of true north. The variation is 13 degrees East, which means the magnetic north is 13 degrees to the East of true north. To find the magnetic bearing, we need to subtract the compass error and add the variation to the true bearing. Therefore, 315 degrees - 15 degrees + 13 degrees = 313 degrees. However, since the answer options do not include 313 degrees, the closest option is 302 degrees.

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• 2.

True bearing 315 degrees, compass error 15 degrees East, variation 13 degrees East Find compass bearing

• A.

298 degrees

• B.

328 degrees

• C.

300 degrees

• D.

302 degrees

C. 300 degrees
Explanation
The true bearing is given as 315 degrees. However, there is a compass error of 15 degrees East and a variation of 13 degrees East. To find the compass bearing, we need to subtract the compass error and variation from the true bearing. Subtracting 15 degrees East from 315 degrees gives us 300 degrees. Therefore, the compass bearing is 300 degrees.

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• 3.

True bearing 315 degrees, compass error 15 degrees East, variation 13 degrees East Find deviation

• A.

28 degrees East

• B.

28 degrees West

• C.

2 degrees East

• D.

2 degrees West

C. 2 degrees East
Explanation
The deviation can be found by subtracting the compass error from the variation. In this case, the compass error is 15 degrees East and the variation is 13 degrees East. Subtracting 15 degrees from 13 degrees gives us a deviation of 2 degrees East.

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• 4.

Given:  Compass course 005 degrees, variation 9 degrees East, deviation 7 degrees West Find: magnetic course

• A.

12 degrees

• B.

12 degrees East

• C.

358 degrees

• D.

358 degrees West

C. 358 degrees
Explanation
The magnetic course can be found by subtracting the deviation from the compass course and then adding the variation. In this case, the compass course is 005 degrees, the deviation is 7 degrees West, and the variation is 9 degrees East. Subtracting 7 degrees from 005 degrees gives us 358 degrees, and then adding 9 degrees gives us a final magnetic course of 358 degrees.

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• 5.

Given:  Compass course 005 degrees, variation 9 degrees East, deviation 7 degrees West Find: CE

• A.

16 degrees East

• B.

2 degrees East

• C.

16 degrees West

• D.

358 degrees West

B. 2 degrees East
Explanation
The compass course is given as 005 degrees, which means the desired direction is 5 degrees East of North. The variation is given as 9 degrees East, which means the magnetic north is 9 degrees East of true north. The deviation is given as 7 degrees West, which means the compass needle points 7 degrees to the West of magnetic north. To find the compass error (CE), we need to subtract the deviation from the variation. Therefore, CE = 9 degrees East - 7 degrees West = 2 degrees East.

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• 6.

Given:  Compass course 005 degrees, variation 9 degrees East, deviation 7 degrees West Find: true course

• A.

007 degrees

• B.

367 degrees

• C.

005 degrees

• D.

003 degrees

A. 007 degrees
Explanation
The true course can be found by adding the compass course to the variation and subtracting the deviation. In this case, 005 degrees (compass course) + 9 degrees (variation) - 7 degrees (deviation) equals 007 degrees.

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• 7.

Given: true course 357 degrees, deviation 5 degrees East, compass error 22 degrees West Find: Variation

• A.

17 degrees West

• B.

17 degrees East

• C.

27 degrees West

• D.

27 degrees East

C. 27 degrees West
Explanation
The variation can be calculated by subtracting the compass error from the deviation. In this case, the deviation is 5 degrees East and the compass error is 22 degrees West. Subtracting 22 degrees from 5 degrees gives us a variation of 27 degrees West.

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• 8.

Given: true course 357 degrees, deviation 5 degrees East, compass error 22 degrees West Find: magnetic course

• A.

002 degrees

• B.

335 degrees

• C.

027 degrees

• D.

024 degrees

D. 024 degrees
Explanation
The magnetic course can be found by subtracting the deviation from the true course and then adding the compass error. In this case, subtracting 5 degrees (deviation) from 357 degrees (true course) gives us 352 degrees. Then adding 22 degrees (compass error) to 352 degrees gives us a magnetic course of 374 degrees. However, since the question asks for the answer in three digits, we need to subtract 360 degrees from 374 degrees, resulting in a magnetic course of 014 degrees.

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• 9.

Given: true course 357 degrees, deviation 5 degrees East, compass error 22 degrees West Find: compass course

• A.

335 degrees

• B.

019 degrees

• C.

027 degrees

• D.

024 degrees

B. 019 degrees
Explanation
The compass course can be found by subtracting the deviation and compass error from the true course. In this case, the deviation is 5 degrees East and the compass error is 22 degrees West. Subtracting 5 degrees from 357 degrees gives us 352 degrees, and then subtracting 22 degrees from 352 degrees gives us 330 degrees. Therefore, the compass course is 330 degrees.

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• 10.

Given: true bearing 347 degrees, compass bearing 005 degrees, magnetic bearing 355 degrees Find: compass error

• A.

10 degrees East

• B.

18 degrees West

• C.

18 degrees East

• D.

10 degrees West

B. 18 degrees West
Explanation
The compass error can be determined by finding the difference between the true bearing and the compass bearing. In this case, the true bearing is 347 degrees and the compass bearing is 005 degrees. Subtracting 005 from 347 gives us 342 degrees. Since the compass error is measured in the opposite direction of the compass bearing, the compass error is 18 degrees west.

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• 11.

Given: true bearing 347 degrees, compass bearing 005 degrees, magnetic bearing 355 degrees Find: deviation

• A.

10 degrees East

• B.

18 degrees West

• C.

18 degrees East

• D.

10 degrees West

D. 10 degrees West
Explanation
The true bearing is given as 347 degrees, which means that the direction is 347 degrees clockwise from true north. The compass bearing is given as 005 degrees, which means that the direction is 5 degrees clockwise from magnetic north. The magnetic bearing is given as 355 degrees, which means that the direction is 355 degrees clockwise from magnetic north. To find the deviation, we need to determine the difference between the compass bearing and the magnetic bearing. In this case, the compass bearing is 5 degrees and the magnetic bearing is 355 degrees, so the deviation is 10 degrees west.

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• 12.

Given: true bearing 347 degrees, compass bearing 005 degrees, magnetic bearing 355 degrees Find: variation

• A.

8 degrees East

• B.

8 degrees West

• C.

18 degrees East

• D.

18degrees West

B. 8 degrees West
Explanation
The true bearing is given as 347 degrees, which means the direction is almost towards the northwest. The compass bearing is given as 005 degrees, which means the compass is pointing almost towards the north. The magnetic bearing is given as 355 degrees, which means the magnetic north is almost towards the northwest. The difference between the true bearing and the magnetic bearing is the variation. In this case, the variation is 8 degrees to the west.

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• 13.

Convert time to arc 00 hours 15 minutes 05 seconds

• A.

03 degrees 46 minutes 15 seconds

• B.

003 degrees 46 minutes 15 seconds

• C.

3 degrees 46 minutes 15 seconds

• D.

None of the above

B. 003 degrees 46 minutes 15 seconds
Explanation
The given answer, "003 degrees 46 minutes 15 seconds," is the correct conversion of the given time to arc. In this conversion, the hours, minutes, and seconds are converted into degrees, minutes, and seconds respectively. The "003" represents the degrees, "46" represents the minutes, and "15" represents the seconds. Therefore, the correct answer is "003 degrees 46 minutes 15 seconds."

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• 14.

Convert time to arc 23 hours 36 minutes 05 seconds

• A.

001 degrees 34 minutes 24 seconds

• B.

354 degrees 01 minutes 15 seconds

• C.

006 degrees 01 minutes 15 seconds

• D.

359 degrees 34 minutes 24 seconds

B. 354 degrees 01 minutes 15 seconds
Explanation
The given time is being converted to arc. The answer, 354 degrees 01 minutes 15 seconds, represents the converted time in arc format.

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• 15.

Convert old form of compass reading to new form of compass reading N 00 degrees E

• A.

360 degrees

• B.

000 degrees

• C.

045 degrees

• D.

315 degrees

B. 000 degrees
Explanation
The old form of compass reading uses the cardinal directions (North, South, East, West) and the degrees are measured clockwise from North. In the given old form reading "N 00 degrees E", N represents North and 00 degrees represents the angle between North and East, which is 0 degrees. Therefore, the correct answer in the new form of compass reading would be "000 degrees".

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• 16.

Convert old form of compass reading to new form of compass reading N 75 degrees E

• A.

345 degrees

• B.

165 degrees

• C.

255 degrees

• D.

075 degrees

D. 075 degrees
Explanation
The correct answer is 075 degrees. This is because the old form of compass reading, N 75 degrees E, is equivalent to 075 degrees in the new form of compass reading. The N indicates the direction (North) and the 75 degrees E indicates the angle measured clockwise from North. Therefore, the correct conversion is 075 degrees.

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• 17.

Convert new form of compass reading to old form of compass reading 285 degrees

• A.

N 15 degrees W

• B.

N 15 degrees E

• C.

S 15 degrees W

• D.

S 15 degrees E

A. N 15 degrees W
Explanation
The given compass reading of 285 degrees can be converted to the old form of compass reading as N 15 degrees W.

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• 18.

Convert arc to time 00 degrees 15 minutes 30 seconds

• A.

00 hours 01 minutes 02 seconds

• B.

03 hours 52 minutes 30 seconds

• C.

24 hours 01 minutes 30 seconds

• D.

15 hours 52 minutes 30 seconds

A. 00 hours 01 minutes 02 seconds
Explanation
The given question is asking to convert an arc measurement of 00 degrees 15 minutes 30 seconds into time measurement. The correct answer of "00 hours 01 minutes 02 seconds" suggests that the conversion has been done correctly.

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• 19.

Convert arc to time 13 degrees 05 minutes 15 seconds

• A.

00 degrees 52 minutes 21 seconds

• B.

00 hours 52 minutes 21 seconds

• C.

196 degrees 18 minutes 45 seconds

• D.

196 hours 18 minutes 45 seconds

B. 00 hours 52 minutes 21 seconds
Explanation
The correct answer is "00 hours 52 minutes 21 seconds." This is the correct conversion of the given arc measurement of 13 degrees 05 minutes 15 seconds into time format.

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• 20.

Convert arc to time 000 degrees 15 minutes 00 seconds

• A.

00 degrees 01 minutes 00 seconds

• B.

00 hours 01 minutes 00 seconds

• C.

03 hours 45 minutes 00 seconds

• D.

03 degrees 45 minutes 00 seconds

B. 00 hours 01 minutes 00 seconds
Explanation
The given answer of "00 hours 01 minutes 00 seconds" is the correct conversion of the given arc measurement of "000 degrees 15 minutes 00 seconds" into time. In this conversion, the degrees are converted into hours, the minutes remain the same, and the seconds remain the same. Therefore, the arc measurement of "000 degrees 15 minutes 00 seconds" can be converted to "00 hours 01 minutes 00 seconds" in time.

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• Current Version
• Mar 19, 2023
Quiz Edited by
ProProfs Editorial Team
• Jun 28, 2011
Quiz Created by
Torah_tesay