# Nav 1 Prelim A (20 Items)

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Torah_tesay
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Quizzes Created: 20 | Total Attempts: 47,565
Questions: 20 | Attempts: 2,012  Settings  Quiz number 1

• 1.

### 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 correct answer is "003 degrees 46 minutes 15 seconds". This is the correct format for converting time to arc, where the hours are represented as degrees, the minutes as minutes, and the seconds as seconds.

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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, which means the compass is pointing 15 degrees to the right of the true bearing. Additionally, there is a variation of 13 degrees East, which means the magnetic north is 13 degrees to the right of the true north. To find the compass bearing, we need to subtract the compass error and variation from the true bearing. Therefore, the compass bearing would be 315 degrees - 15 degrees - 13 degrees = 287 degrees. However, since the answer choices do not include this option, we can conclude that there may be a mistake in the question or the answer choices.

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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 from 13 gives us a deviation of 2 degrees East.

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• 4.

### 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. The compass error is 15 degrees East, which means the compass is reading 15 degrees more than the true bearing. 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 subtract the compass error and add the variation to the true bearing. Therefore, the magnetic bearing is 315 - 15 + 13 = 313 degrees. However, since the answer choices are given in 10-degree increments, the closest option is 302 degrees.

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• 5.

### 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 answer, 00 hours 01 minutes 02 seconds, is the correct conversion of the arc measurement, 00 degrees 15 minutes 30 seconds, into time. The degrees are converted to hours, the minutes are converted to minutes, and the seconds are converted to seconds. Therefore, the answer is 00 hours 01 minutes 02 seconds.

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• 6.

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

• A.

360 degrees

• B.

090 degrees

• C.

045 degrees

• D.

315 degrees

A. 360 degrees
Explanation
The old form of compass reading is given as "N 00 degrees E". In the new form of compass reading, the direction "N" is equivalent to 0 degrees and the direction "E" is equivalent to 90 degrees. Therefore, the old form of compass reading "N 00 degrees E" can be converted to the new form as 0 degrees + 90 degrees = 90 degrees. However, none of the answer options match this conversion. Therefore, the correct answer is not available.

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• 7.

### 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. Variation is the angular difference between true north and magnetic north, and it is given as 9 degrees East. Deviation is the angular difference between magnetic north and compass north, and it is given as 7 degrees West. To find the true course, we need to subtract the deviation from the compass course. 005 degrees - 7 degrees = -2 degrees. Since the deviation is in the opposite direction of the compass course, we need to add the variation to the true course. -2 degrees + 9 degrees = 7 degrees. Therefore, the correct answer is 2 degrees East.

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• 8.

### 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 deviation is 7 degrees West, so we subtract 7 from the compass course of 005 degrees. This gives us 358 degrees. Then, we add the variation of 9 degrees East to get the magnetic course of 358 degrees.

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• 9.

### 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 calculated by adding the compass course to the variation and subtracting the deviation. In this case, the compass course is 005 degrees, the variation is 9 degrees East, and the deviation is 7 degrees West. Adding 005 degrees to 9 degrees East gives us 014 degrees, and subtracting 7 degrees West gives us 007 degrees. Therefore, the true course is 007 degrees.

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• 10.

### 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 answer, 354 degrees 01 minutes 15 seconds, represents the conversion of the given time, 23 hours 36 minutes 05 seconds, into arc. The conversion is done by multiplying the hours by 15 (since there are 15 degrees in one hour), the minutes by 0.25 (since there are 0.25 degrees in one minute), and the seconds by 0.00417 (since there are 0.00417 degrees in one second). Adding up these values gives us the final answer of 354 degrees 01 minutes 15 seconds.

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• 11.

### 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 West from 5 degrees East gives us a variation of 27 degrees West.

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• 12.

### 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 and compass error from the true course. In this case, 5 degrees East is subtracted from 357 degrees, resulting in 352 degrees. Then, 22 degrees West is subtracted from 352 degrees, resulting in a magnetic course of 330 degrees. Therefore, the given answer of 024 degrees is incorrect.

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• 13.

### 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, 357 degrees - 5 degrees (deviation) - 22 degrees (compass error) equals 330 degrees. However, since the compass error is specified as being west, it needs to be added instead of subtracted. Therefore, the correct compass course is 357 degrees + 5 degrees (deviation) + 22 degrees (compass error) which equals 384 degrees.

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• 14.

### 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 given answer "00 hours 52 minutes 21 seconds" is the correct conversion of the arc measurement "13 degrees 05 minutes 15 seconds" into time. It indicates that the arc measurement can be represented as a time measurement of 00 hours 52 minutes 21 seconds.

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• 15.

### 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 is 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. To find the compass error, we subtract the compass bearing from the true bearing. 347 degrees - 005 degrees = 342 degrees. However, since the compass bearing is given in the range of 0-360 degrees, we need to subtract this result from 360 degrees to get the correct compass error. 360 degrees - 342 degrees = 18 degrees. Therefore, the compass error is 18 degrees West.

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• 16.

### 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 compass bearing is given as 005 degrees, which means it is pointing towards the North. The magnetic bearing is given as 355 degrees, which means it is 10 degrees West of North. The true bearing is given as 347 degrees, which means it is 18 degrees West of North. Therefore, the deviation is the difference between the magnetic bearing and the true bearing, which is 10 degrees West.

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• 17.

### 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 magnetic bearing is 355 degrees, which means that the magnetic north is 355 degrees from the true north. The compass bearing is 005 degrees, which means that the compass north is 005 degrees from the magnetic north. Therefore, the compass north is actually 360 degrees - 355 degrees + 005 degrees = 010 degrees from the true north. This means that there is a variation of 10 degrees between the true north and the compass north. Since the compass north is to the west of the true north, the variation is 10 degrees west. Therefore, the answer is 8 degrees west.

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• 18.

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

• A.

N 75 degrees W

• B.

N 15 degrees E

• C.

S 15 degrees W

• D.

S 15 degrees E

A. N 75 degrees W
Explanation
The given compass reading of 285 degrees can be converted to the old form by subtracting it from 360 degrees. This gives us 75 degrees. Since the reading is in the northwest quadrant, the correct answer is N 75 degrees W.

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• 19.

### 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, "00 hours 01 minutes 00 seconds," is the correct conversion of the arc measurement "000 degrees 15 minutes 00 seconds" to time. In this conversion, the degrees are converted to hours, the minutes remain the same, and the seconds remain the same. Therefore, the answer is "00 hours 01 minutes 00 seconds."

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• 20.

### 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 Back to top