Pass Benchmark: 70% (21/30) • Standard: USCG NMC / 46 CFR
USCG General Navigation (Set 25)
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Question 1 of 30
Index error of a sextant is primarily caused by __________.
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30 MCQs #1 Index error of a sextant is primarily caused by __________. #2 A sextant having an index error that is "on the arc" has a __________. #3 Air circulation is caused or affected by __________. #4 Weather forecast messages are usually __________. #5 Yesterday your chronometer read 11h 59m 59s at 1200 GMT time tick. Today the chronometer reads 12h 00m 01s at the 1200 GMT tick. What is the chronometer rate? #6 On a weather map, a large letter "H" means __________. #7 The direction of the surface wind is __________. #8 While navigating in fog off a coastline of steep cliffs, you hear the echo of the ships fog horn 2 seconds after the signal was sounded. What is the distance to the shore? #9 If the current and wind are in the same direction, the sea surface represents a wind speed __________. #10 You are steaming eastward in the North Atlantic in an extratropical cyclonic storm and the wind is dead ahead. According to the law of Buys Ballot, the center of the low pressure lies __________. #11 A line of clouds, sharp changes in wind direction, and squalls are most frequently associated with a(n) __________. #12 Monsoons are characterized by __________. #13 Chronometer error may be found by __________. #14 You are underway on course 050°T and your maximum speed is 10 knots. The eye of a hurricane bears 100°T, 90 miles from your position. The hurricane is moving towards 285°T at 19 knots. If you maneuver at 10 knots to avoid the hurricane, what could be the maximum CPA? #15 What is TRUE concerning an anemometer on a moving vessel? #16 An Electronic Plotting Aid (EPA) will drop off a target's vector if more than __________ minutes elapse between each manual plot. #17 The climate of the eastern Gulf coast __________. #18 What is TRUE of the history display of a target's past positions on an ARPA? #19 The steepness of a cold front depends on __________. #20 Your vessel is participating in the Voluntary Observing Ship Program, at 1200 ZT on 31 July, your position is LAT 24°33'N, LONG 173°05'W. You are preparing WS Form B-80 as seen in illustration D041NG below. How should you encode the first three groups after the call sign if you estimate the wind? #21 While navigating in fog off a coastline of steep cliffs, you hear the echo of the ships fog horn 3 1/2 seconds after the signal was sounded. What is the distance to the shore? #22 Which of the four adjustable errors in the sextant is the principle cause of index error? #23 Which of the following statements is TRUE regarding automatic identification systems (AIS)? #24 Your ARPA has automatic speed inputs from the log. Due to currents, the log is indicating a faster speed than the speed over the ground. What should you expect under these circumstances? #25 A very light breeze that causes ripples on a small area of still water is a __________. #26 A sea breeze is a wind __________. #27 Advection fog is most commonly caused by __________. #28 Your vessel is participating in the Voluntary Observing Ship Program, you are preparing WS Form B-80 as seen in illustration D041NG below. Twenty-five percent of the sky is covered with clouds, and the anemometer indicates that the apparent wind is from 062° relative at 13 knots. You are on course 238°T at 22 knots. How should you encode group Nddff? #29 A low HDOP (Horizontal Dilution of Precision) number such as 2 indicates a __________. #30 Because of the reflecting properties of a sextant, if the sextant altitude reads 60° on the limb, the actual arc of the limb from 0° to the 60° reading is __________.
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