This is an interactive test. Read each question and select the proper answer by clicking on the appropriate answer. If a "Y" appears, your choice is correct. If a "N" appears, more study may be in order.
3: Blinking of a Loran-C signal indicates __________.
N a. the signal is in proper sequence N b. there will be no increase or decrease in kHz Y c. there is an error in the transmission of that signal N d. that it has the proper GRI 27: Spring tides are tides that __________.
Y a. have lows lower than normal and highs higher than normal N b. have lows higher than normal and highs lower than normal N c. are unpredictable N d. occur in the spring of the year 102: Which statement about an NGA (NIMA) chart with stock no.23BHA23433 is TRUE?
N a. This is a non-navigational or special purpose chart. N b. It is not included in the portfolio. Y c. It is a chart of an area in subregion 23. N d. It depicts a major portion of an ocean. 170: Which of the buoy symbols in illustration D032NG indicates a safe water mark?
Y a. D N b. C N c. B N d. A 264: Which of the four adjustable errors in the sextant is the principle cause of index error?
N a. Telescope not being parallel to the frame Y b. Index mirror and horizon glass not being parallel N c. Index mirror not being perpendicular to the frame N d. Horizon glass not being perpendicular to the frame 280: Under the U.S. Aids to Navigation System, a lighted buoy with a spherical topmark marks __________.
N a. the port side of the channel Y b. safe water N c. a hazard to navigation N d. the position of underwater cables 312: The depth of water on a chart is indicated as 23 meters. This is equal to __________.
N a. 11.5 fathoms Y b. 12.6 fathoms N c. 69.0 feet N d. 78.6 feet 372: You would find the variation on a polyconic projection chart __________.
Y a. on the compass rose N b. on the mileage scale N c. written on the chart title N d. at each line of longitude 407: What would be the height of the tide at Crisfield, MD, at 0310 DST (ZD +4) on 6 May 1983?
N a. 0.1 foot Y b. 0.5 foot N c. 1.1 feet N d. 1.6 feet 440: You are inbound in a channel marked by a range. The range line is 309°T. You are steering 306°T. The range appears as shown and is closing. Which action should you take? (D047NG )
N a. Continue on the present heading until the range is in line, then alter course to the left. N b. Immediately alter course to the right to bring the range in line. N c. Immediately alter course to 309°T. Y d. Continue on course until the range is closed, then alter course to the right. 518: With regard to GPS, a civilian receiver may be capable of achieving the same accuracy as a military receiver if __________.
Y a. selective availability is set to zero N b. the satellites are all below 15° in elevation N c. your vessel is equipped with a Doppler receiver N d. the horizontal dilution of precision is high 575: The horizontal plane, perpendicular to the zenith-nadir axis, that intersects with the celestial sphere and is tangent to the earth is called the __________.
N a. celestial horizon N b. sensible horizon N c. visible horizon Y d. geoidal horizon 588: 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?
N a. 39 miles N b. 45 miles Y c. 53 miles N d. 59 miles 600: The dangerous semicircle of a typhoon in the Southern Hemisphere is that area __________.
N a. measured from due south clockwise 180° N b. measured from due south counterclockwise 180° Y c. to the left of the storm's track N d. ahead of the typhoon measured from the storm's track to 90° on each side 705: The precession of the equinoxes occurs in a(n) __________.
N a. easterly direction Y b. westerly direction N c. northerly direction N d. southerly direction 802: Which is a weekly publication advising mariners of important matters affecting navigational safety?
N a. Light List Y b. Notice to Mariners N c. Coast Pilot N d. Sailing Directions 834: In many areas "atoll" clouds (clouds of vertical development) are produced over small islands. These are the result of __________.
Y a. rising air currents produced by the warm islands N b. warm air from the sea rising over higher land areas N c. cool land air mixing with warm sea air N d. descending air over the islands 959: What is the index error of sextant B in illustration D050NG? (D050NG )
N a. 0'30" off the arc N b. 1'00" off the arc Y c. 3'30" off the arc N d. 1'30" on the arc 1004: A low, uniform layer of cloud resembling fog, but not resting on the ground, is called __________.
N a. cumulus N b. nimbus Y c. stratus N d. cirrus 1067: The two most effective generating forces of surface ocean currents are __________.
N a. temperature and salinity differences in the water Y b. wind and density differences in the water N c. water depth and underwater topography N d. rotation of the Earth and continental interference 1119: The position labeled "D" was plotted because __________. (D051NG )
N a. the vessel's speed changed at 1125 N b. a dead reckoning position is plotted within 30 minutes of a running fix Y c. a dead reckoning position is plotted for each course change N d. All of the above 1146: What is true about a front?
N a. A front is a boundary between two air masses. N b. There are abrupt temperature differences on opposite sides of a front. N c. The pressure tendencies are different on opposite sides of a front. Y d. All of the above 1184: Your position X is at LAT 35°S. Which winds are you experiencing? (D009NG )
Y a. Northeasterly N b. Northwesterly N c. Southeasterly N d. Southwesterly 1263: The compass deviation changes as the vessel changes __________.
N a. geographical position N b. speed Y c. heading N d. longitude 1291: The period of a lighted aid to navigation refers to the __________.
N a. date of construction or establishment N b. length of time between flashes of the light N c. time required for the longest flash of each cycle Y d. time required for the light to complete each cycle 1307: What will be the velocity of the tidal current southwest of Hunts Point, NY, at 0932 EST (ZD +5) on 16 March 1983?
N a. 0.9 knot Y b. 1.5 knots N c. 1.8 knots N d. 2.3 knots 1333: If a magnetic compass is not affected by any magnetic field other than the Earth's, which statement is TRUE?
Y a. Compass error and variation are equal. N b. Compass north will be true north. N c. Variation will equal deviation. N d. There will be no compass error. 1377: What is the velocity of the tidal current at the east end of Pollock Rip Channel at 1700 DST (ZD +4) on 23 July 1983?
N a. 0.6 knot ebbing N b. 0.8 knot flooding Y c. 1.5 knots flooding N d. 1.9 knots flooding 1400: Which type of cloud is among the most dependable for giving an indication of an approaching weather system?
N a. Cumulus Y b. Altostratus N c. Cumulostratus N d. Nimbus 1432: What benefit is a weather bulletin to a mariner?
N a. It provides a legal reason to cancel a projected voyage. N b. It allows the mariner to make long term weather forecasts. N c. It is of little benefit since the weather changes frequently and rapidly. Y d. It gives the mariner time to prepare for weather changes. 1438: In the Northern Hemisphere you are caught in the dangerous semicircle of a storm with plenty of sea room available. The best course of action is to bring the wind on the __________.
N a. port quarter and make as much headway as possible N b. starboard quarter and make as much headway as possible Y c. starboard bow and make as much headway as possible N d. port bow and make as much headway as possible 1493: You are running parallel to the coast and estimate that the current is against you. In plotting a running fix using bearings from the same object on the coast, the greatest safety margin from inshore dangers will result if what speed is used to determine the fix?
Y a. Minimum speed estimate N b. Maximum speed estimate N c. Average speed estimate N d. A running fix should not be used under these conditions. 1564: What is a characteristic of cardinal marks?
Y a. Light rhythms indicating directional orientation N b. Vertical stripes N c. Square or triangular topmarks N d. Number-letter combinations for identification 1615: The Illustration shows the symbols used on radio facsimile weather charts. Which symbol indicates snow? (D042NG )
N a. G N b. H Y c. M N d. N 1690: In regions near the poles, the winds are generally described as __________.
N a. westerlies Y b. easterlies N c. northerlies N d. southerlies 1734: The eye of the hurricane has __________.
N a. very high barometric pressure N b. average barometric pressure Y c. the lowest barometric pressure N d. no change in barometric pressure 1743: In the Northern Hemisphere, if your vessel is in a hurricane's navigable semicircle it should be positioned with the wind on the __________.
Y a. starboard quarter, hold course and make as much speed as possible N b. port bow, hold course and make as much speed as possible until the hurricane has passed N c. port quarter, maintain course and make as much speed as possible N d. starboard bow and heave to until the hurricane has passed 1882: The GP of a body for a high altitude sight is determined from the Greenwich hour angle and the __________.
N a. circle of equal altitude N b. zenith distance N c. azimuth angle Y d. declination 1955: The letter A in illustration D006NG represents the __________.
N a. geoidal horizon Y b. sensible horizon N c. celestial horizon N d. visible horizon 1969: The precession of the equinoxes of the Earth is __________.
N a. the gradual increase in the period of rotation caused by the effects of the Moon N b. the irregularity of the Earth's orbit caused by influences of the Sun and Moon N c. caused by the elliptical shape of the Earth's orbit Y d. similar to a top spinning with its axis tilted 2220: A dead reckoning (DR) plot __________.
N a. must utilize magnetic courses N b. must take set and drift into account N c. should be replotted hourly Y d. should be started each time the vessel's position is fixed 2312: Mars is only seen at two phases, one of which __________.
Y a. is the full phase N b. is conjunction N c. occurs only at sunset or sunrise N d. occurs at or near 0° elongation 2350: The principal advantage of NAVTEX radio warnings is that __________.
Y a. they can be used by mariners who do not know Morse code N b. only an ordinary FM radio is necessary to receive these warnings N c. information on a given topic is only broadcast at specified times N d. they cover a broad spectrum of the radio band allowing reception on almost any type of receiver 2360: What U.S. agency is responsible for NAVAREA warnings?
N a. Coast Guard N b. National Oceanic and Atmospheric Administration N c. National Ocean Service Y d. National Geospatial-Intelligence Agency 2435: What is a lighted safe water mark fitted with to aid in its identification?
N a. A red and white octagon N b. Red and white retroreflective material N c. A sequential number Y d. A spherical topmark 2454: Illustration D037NG represents a moveable dam. If the wickets are down and there are open weirs due to high water, what light(s) will be shown at C if the lock walls and piers are not awash? (D037NG )
N a. One red light Y b. Two red lights N c. Three red lights N d. One amber light 2589: Under the IALA cardinal system, a mark with a quick white light showing 6 flashes followed by one long flash indicates that the safest water is on the __________.
N a. north side of the mark N b. west side of the mark N c. east side of the mark Y d. south side of the mark 2672: When you are steering on a pair of range lights and find the upper light is in line above the lower light, you should __________.
Y a. continue on the present course N b. come left N c. come right N d. wait until the lights are no longer in a vertical line 2696: You must draw a plotting sheet covering latitudes 52°S to 56°S and longitudes 179°W to 175°E. If the distance between latitude 52°S to 56°S is 24 inches, what is the distance between the meridians of 1° of longitude?
N a. 3.2 inches Y b. 3.5 inches N c. 4.0 inches N d. 4.2 inches 2726: A daymark used as a special mark is indicated by which letter in the diagram? (D045NG )
N a. A Y b. B N c. C N d. D 2762: You take a bearing of 176° of a lighthouse. Which bearing of another object would give the best fix?
Y a. 079° N b. 151° N c. 176° N d. 292° 2770: What is most likely to happen when you push a multiple tow into a countercurrent?
N a. Going upstream you will make better speed with no danger involved. N b. Going downstream you will be slowed down but will keep control of the tow. Y c. There is a good chance you will break up the tow. N d. No danger exists as long as you steer a straight course through the eddy. 2809: The diurnal variation of pressure is not visible in the middle latitudes in winter because __________.
Y a. it is masked by the pressure changes of moving weather systems N b. the decreased gravitational effect from the sun causes the variation to fade N c. the decreased average temperature is less than the critical temperature N d. the increased Coriolis force disperses the pressure variation 2850: What is used to help prevent damage to barges, locks, and landings when you are locking or landing a tow?
N a. Dock cushions N b. Springers N c. Landing bars Y d. Bumpers (fenders) 2884: The pictures shown represent the geographic location of a vessel and the radar presentation at the same time. Which statement is TRUE? (D011NG )
Y a. Ship No. 1 does not appear as an individual target due to the effect of beam width. N b. Small island is not detected due to the multiple echo effect from the mountain. N c. A tangent bearing of the headland to the south-southeast is corrected by subtracting one-half of the beam width. N d. Ship No. 2 is not detected due to the side lobe effect of radar reflecting from the mountain. 2931: The vertical distance from the tidal datum to the level of the water is the __________.
N a. range of tide Y b. height of tide N c. actual water depth N d. charted depth 3017: A rotary current sets through all directions of the compass. The time it takes to complete one of these cycles, in a locale off the East coast of the US, is approximately __________.
N a. 3 hours N b. 6 1/4 hours Y c. 12 1/2 hours N d. 18 3/4 hours 3022: A green-and-red banded daymark, green band uppermost, will have the shape shown at letter __________. (D045NG )
Y a. A N b. B N c. C N d. D 3056: A position obtained by applying ONLY your vessel's course and speed to a known position is a __________.
N a. fix Y b. dead-reckoning position N c. running fix N d. probable position 3070: The database information that should be shown when a chart is first displayed on ECDIS is the __________.
N a. display base information Y b. standard display information N c. system electronic nautical chart N d. chart display information