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.
64: Mean lower low water is the reference plane used for __________.
N a. all vertical measurements N b. heights above water for lights, mountains, etc. Y c. soundings on the U.S. east and west coasts N d. water depths on the U.S. east coast only 69: The parallax angle will vary the most with the time of year for __________.
Y a. Venus N b. Jupiter N c. Saturn N d. Polaris 96: A weather forecast states that the wind will commence veering. In the Northern Hemisphere this indicates that the wind will __________.
Y a. shift in a clockwise manner N b. shift in a counterclockwise manner N c. continue blowing from the same direction N d. increase in velocity 109: While proceeding along the Norwegian coast on course 039°T, you sight the black-yellow-black banded buoy shown bearing 053°T. What action should you take? (D021NG )
N a. Alter course to 053° and leave the buoy close aboard on either side N b. Maintain course Y c. Alter course to 060° and ensure that the true bearings decreases N d. Alter course to port to rapidly open the bearing to the right 132: The value of sixty nautical miles per degree of geodetic latitude is most correct at __________.
N a. the equator Y b. latitude 45° N c. the poles N d. all latitudes 135: The standard meridian for the time zone +1 is __________.
N a. 0° N b. 7 1/2°W Y c. 15°W N d. 7 1/2°E 191: Safe water buoys may show ONLY __________.
N a. flashing red lights N b. flashing green lights Y c. white lights N d. yellow lights 192: The description "Racon" beside an illustration on a chart would mean a __________.
N a. radar conspicuous beacon N b. circular radio beacon Y c. radar transponder beacon N d. radar calibration beacon 199: Civil twilight occurs at 0558 zone time on 30 December 1981. Your DR position at that time is LAT 15°02'N, LONG 46°02'W. Which statement concerning the planets available for morning sights is TRUE?
Y a. At 0558, Mars can be used for an ex-meridian observation. N b. Venus, Jupiter, and Mars sights will yield a good three line fix. N c. Saturn will be near the prime vertical. N d. Venus will be visible low in the western sky. 217: In some parts of the world there is often a slight fall in tide during the middle of the high water period. The effect is to create a longer period of stand at higher water. This special feature is called a(n) __________.
N a. apogean tide Y b. double high water N c. perigean tide N d. bore 238: The predicted time that the flood begins at the entrance to Delaware Bay is 1526. You are anchored off Chestnut St. in Philadelphia. If you get underway bound for sea at 1430 and turn for 11 knots, at what point will you lose the ebb current?
N a. New Castle Y b. Liston Pt. N c. Arnold Pt. N d. Ship John Shoal Lt. 265: It is 1200 local time for an observer at 54°E longitude. Which statement is TRUE?
N a. It is afternoon at Greenwich. N b. It is midnight at 126°E longitude. Y c. The observer is in time zone -4. N d. All of the above are true. 323: The position accuracy of Loran-C degrades with increasing distance from the transmitting stations as __________.
N a. gains are made over the signal path Y b. a result of variation in propagation conditions N c. the frequency of the pulses increases N d. the stations shift pulses 378: A navigator fixing a vessel's position by radar __________.
N a. should never use radar bearings Y b. can use radar information from one object to fix the position N c. should only use radar bearings when the range exceeds the distance to the horizon N d. must use information from targets forward of the beam 435: If an observer is at 35°N latitude, his zenith is __________.
N a. 55°S of the celestial equator N b. at the north celestial pole Y c. 35°N of the celestial equator N d. 55°N of the celestial equator 541: A yellow buoy may mark a(n) __________.
N a. wreck N b. shoal area Y c. anchorage area N d. middle ground 566: You are attempting to locate your position relative to a hurricane in the Northern Hemisphere. If the wind direction remains steady, but with diminishing velocity, you are most likely __________.
N a. in the right semicircle N b. in the left semicircle N c. on the storm track ahead of the center Y d. on the storm track behind the center 612: Which statement is TRUE concerning a Mercator projection?
N a. Degrees of longitude decrease in length as latitude increases. Y b. The length of the meridians is increased to provide for equal expansion in all directions. N c. The mileage between the meridians is increased as the latitude increases. N d. All of the above 722: Which publication would describe the explosive anchorages in the ports on the east coast of the United States?
N a. Sailing Directions N b. Pilot Rules for Inland Waters Y c. Coast Pilot N d. Notice to Mariners 770: You are plotting a running fix in an area where there is a determinable current. How should this current be treated in determining the position?
Y a. The course and speed made good should be determined and used to advance the LOP. N b. The drift should be added to the ship's speed. N c. The current should be ignored. N d. The set should be applied to the second bearing. 795: The path of a celestial body during its daily apparent revolution around the Earth is called its __________.
N a. ecliptic Y b. diurnal circle N c. altitude circle N d. circle of position 831: Under the IALA-A Buoyage system, a buoy marking the starboard side of the channel when approaching from seaward may have a __________.
Y a. triangular topmark N b. red light N c. can shape N d. isophase light 877: Cold water flowing southward through the western part of the Bering Strait between Alaska and Siberia is joined by water circulating counterclockwise in the Bering Sea to form the __________.
N a. Alaska Current N b. Subarctic Current N c. Kuroshio Current Y d. Oyashio Current 903: Eight points of a compass are equal to how many degrees?
N a. 45 Y b. 90 N c. 180 N d. 360 950: Where is the dangerous semicircle located on a hurricane in the Southern Hemisphere?
Y a. To the left of the storm's track N b. To the right of the storm's track N c. In the high pressure area N d. On the south side 995: What is the equivalent of 83°29.6' in time units?
N a. 5h 47m 34.8s N b. 5h 18m 22.7s N c. 5h 01m 42.3s Y d. 5h 33m 58.4s 1033: Deviation which is maximum on intercardinal compass headings may be removed by the __________.
N a. Flinders bar N b. transverse magnets N c. fore-and-aft magnets Y d. soft iron spheres on the sides of the compass 1054: The dry-bulb temperature is 78°F (26°C) and the wet-bulb temperature is 68°F (20°C). What is the relative humidity?
N a. 10% N b. 24% N c. 56% Y d. 60% 1060: Isobars on a weather map are useful in predicting __________.
N a. temperature N b. dew point Y c. wind velocity N d. relative humidity 1164: The largest waves (heaviest chop) will usually develop where the wind blows __________.
N a. at right angles to the flow of the current Y b. against the flow of the current N c. in the same direction as the flow of the current N d. over slack water 1207: What will be the velocity of the tidal current at New London Harbor Entrance, CT, at 1615 EST (ZD +5) on 26 December 1983?
Y a. 0.2 knot N b. 0.4 knot N c. 0.7 knot N d. 0.9 knot 1209: You are on course 201°T. To check the speed of your vessel you should observe a celestial body on which bearing?
N a. 090° N b. 111° N c. 180° Y d. 201° 1214: The letter B in the diagram represents the __________. (D006NG )
N a. sensible horizon N b. visible horizon N c. celestial horizon Y d. geoidal horizon 1247: What is the predicted velocity of the tidal current 2 miles west of Southwest Ledge for 2330 DST (ZD +4) on 7 September 1983?
Y a. 1.3 knots N b. 1.6 knots N c. 1.9 knots N d. 2.2 knots 1452: When is the rhumb line distance the same as the great circle distance?
N a. Course 090°T in high latitudes Y b. Course 180°T when you cross the equator N c. Course 045°T in low latitudes N d. The rhumb line distance is always longer than the great circle distance. 1467: Determine the time after 0730 EST (ZD +5) when the velocity of the current will be 2.1 knots on 26 March 1983, at Fort Pulaski, GA.
N a. 0802 N b. 0812 N c. 0821 Y d. 0840 1555: Under the U.S. Aids to Navigation System, a yellow buoy is a __________.
N a. safe water buoy N b. junction buoy N c. cardinal mark Y d. special purpose mark 1567: Buoys and day beacons exhibiting a yellow triangle or square painted on them are used __________.
N a. in minor harbors where the controlling depth is 10 feet (3 meters) or less N b. on isolated stretches of the ICW to mark undredged areas Y c. where the ICW and other waterways coincide N d. at particularly hazardous turns of the channel 1571: Which sextant in illustration D043NG reads 29°42.7'? (D043NG )
Y a. A N b. B N c. C N d. D 1590: Civil twilight starts at 1812 zone time on 26 August 1981, Your DR position at that time is LAT 21°06'S, LONG 14°56' W. Which statement concerning the planets available for evening sights is TRUE?
N a. Mars will be near the prime vertical in the eastern sky. Y b. Venus may be identified from Saturn and Jupiter because it is the brightest. N c. Sights of Venus, Jupiter, and Saturn will yield a good three line fix. N d. A sight of either Jupiter, Saturn, or Venus will give a latitude line. 1731: When your vessel is on or near the path of an approaching tropical storm the __________.
N a. wind direction remains steady N b. wind speed increases N c. barometer falls Y d. All of the above 1806: Sometimes foreign charts are reproduced by NGA (NIMA). On such a chart a wire dragged (swept) area may be shown in purple or __________.
Y a. green N b. red N c. magenta N d. yellow 1887: The Light List indicates that a light has a nominal range of 10 miles and is 11 feet high. If the visibility is 15 miles and your height of eye is 20 feet, at what approximate distance will you sight the light?
N a. 12.0 miles N b. 11.0 miles N c. 10.0 miles Y d. 9.0 miles 1902: Under the numbering system used by NGA (NIMA), a four digit number is used for __________.
N a. large scale charts of infrequently navigated areas such as the polar regions N b. charts of rivers or canal systems such as the Ohio River or Erie Canal Y c. non-navigational materials, such as a chart correction template or maneuvering board N d. foreign charts reproduced by NGA (NIMA) 1918: The Moon appears larger in diameter at the zenith than when near the horizon. What is this called?
N a. Parallax in altitude Y b. Augmentation N c. Horizontal parallax N d. Libration 1992: The parallel of latitude at 23°27'S is the __________.
N a. Tropic of Cancer Y b. Tropic of Capricorn N c. Arctic Circle N d. ecliptic 2028: Which stock number indicates an NGA (NIMA) chart designed for navigation and anchorage in a small waterway?
N a. WOAZC17 N b. LCORR5876 Y c. 15XHA15883 N d. PILOT55 2069: Illustration D037NG represents a moveable dam. If a bear trap is open what will be displayed at the lock to indicate this condition? (D037NG )
N a. A flashing amber light Y b. A white circular disc N c. A red diamond N d. Two amber lights 2074: When approaching a lock and at a distance of not more than a mile, vessels desiring a single lockage shall sound which signal?
Y a. One long blast followed by one short blast N b. One short blast followed by one long blast N c. Two short blasts N d. Two long blasts 2076: You should plot your dead reckoning position __________.
Y a. from every fix or running fix N b. from every estimated position N c. every three minutes in pilotage waters N d. only in pilotage waters 2255: The height of tide is the __________.
N a. depth of water at a specific time due to tidal effect N b. difference between the depth of the water at high tide and the depth of the water at low tide N c. difference between the depth of the water and the high water tidal level Y d. difference between the depth of the water and the area's tidal datum 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 2428: If your vessel were proceeding up river (ascending), the port side of the channel would be marked according to the U. S. Aids to Navigation System on the Western Rivers by __________.
Y a. green can buoys N b. red can buoys N c. green nun buoys N d. red nun buoys 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° 2844: The signal from a ramark will show on the PPI as a __________.
N a. coded signal on the same bearing and at a greater range then the transponder N b. circle surrounding the transponder Y c. radial line from the transponder to the center of the PPI N d. dashed circle at the same range as the transponder 2895: A white buoy with an orange rectangle on it is a(n) __________.
N a. junction buoy N b. safe water buoy Y c. informational buoy N d. All of the above 2959: Vessels required to have an Automatic Radar Plotting Aid must have a device to indicate the __________.
N a. time of the next navigational satellite N b. distance to the next port Y c. speed of the vessel over the ground or through the water N d. None of the above 2994: You take a bearing of 313° and 076° of two objects. Which bearing of a third object will give the best fix?
Y a. 014° N b. 133° N c. 255° N d. 339° 3079: With respect to failure warnings and status indications, GPS receivers should provide, at a minimum, __________.
N a. an indication within 5 seconds if the specified HDOP has been exceeded N b. a warning of loss of position N c. a differential GPS status indication of the receipt of DGPS signals Y d. All of the above 3124: Which of the following statements is TRUE regarding automatic identification systems (AIS)?
Y a. AIS is a short-range VHF-FM system that automatically broadcasts a vessel's position, course, speed and other safety related information to all those with similar equipment in the area. N b. AIS is a one-way centrally managed system that requires the local VTS to send commands to instruct each vessel to broadcast position, course, speed and other safety related information to all those with similar equipment in the area. N c. AIS is a global tracking system that relies upon INMARSAT C service to communicate vessel position, course, speed and other safety related information to all those with similar equipment in the area. N d. AIS is a short-range 3 cm X-band radar system that automatically sends a vessel's position, course, speed and other safety related information to all those with similar equipment within the area.