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.
145: The standard time meridian for zone description -1 is __________.
N a. 0° N b. 7 1/2°W N c. 7 1/2°E Y d. 15°E 242: The difference between the heights of low and high tide is the __________.
Y a. range N b. period N c. depth N d. distance 268: The illustration shows the symbols used on radio facsimile weather charts. The symbol indicated at letter "L" represents a __________. (D042NG )
N a. convergence line N b. maritime air mass N c. warm front Y d. convergence zone 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 421: Daylight savings time is a form of zone time that adopts the time __________.
N a. one zone to the west Y b. one zone to the east N c. two zones to the west N d. two zones to the east 424: For an accurate barometer check, you would __________.
N a. check it with a barometer on another vessel N b. take readings from several barometers and average them N c. check it with the barometer at the ship chandlery Y d. check it against radio or National Weather Service reports of the immediate vicinity 560: On 14 April 1981, a back sight is observed of the lower limb of the Sun. The height of eye is 45 feet. The index error is 2.5' on the arc. The sextant altitude (hs) is 117°14.6'. What is the observed altitude (Ho)?
N a. 63°01.9' N b. 63°03.4' N c. 63°07.4' Y d. 63°09.9' 583: The radar control used to reduce sea return at close ranges is the __________.
N a. gain control Y b. sensitivity time control N c. fast time constant N d. pulse length control 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 591: White lights may be found on __________.
N a. special purpose buoys N b. preferred channel buoys Y c. information and regulatory buoys N d. numbered buoys 611: Information markers, when lighted, will display __________.
N a. yellow lights N b. green lights Y c. white lights N d. red lights 615: The spinning motion of a planet around its axis is called __________.
N a. revolution Y b. rotation N c. orbit N d. space motion 641: Buoys which mark isolated dangers are painted with alternating _____________ .
Y a. red and black bands N b. green and black bands N c. red and white stripes N d. green and white bands 719: You are on course 209°T. In order to check the longitude of your vessel, you should observe a celestial body on which bearing?
N a. 209° Y b. 270° N c. 299° N d. 000° 728: In the Bay of Fundy, during twilight, you a take sight of Mars. The sextant altitude (hs) is 03°35.5'. Your height of eye is 32 feet and there is no index error. The air temperature is -10°C and the barometer reads 1010 millibars. What is the observed altitude (Ho)?
N a. 03°14.5' Y b. 03°15.8' N c. 03°16.2' N d. 03°28.8' 730: In the Northern Hemisphere, the largest waves or swells created by a typhoon or hurricane will be located __________.
N a. in the southeast quadrant of the storm N b. directly behind the storm center Y c. forward and to the right of its course N d. behind and to the left of its course 780: Apparent wind speed blowing across your vessel while underway can be measured by a(n) __________.
N a. barometer N b. wind vane Y c. anemometer N d. thermometer 848: It is unlawful to approach within how many yards of a northern right whale?
N a. 200 N b. 300 N c. 400 Y d. 500 893: One point of a compass is equal to how many degrees?
N a. 7.5 Y b. 11.25 N c. 17.5 N d. 22.5 940: What is the length of a nautical mile?
Y a. 6,076 feet N b. 5,280 feet N c. 2,000 yards N d. 1,850 meters 958: You are preparing a weather report form. 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? (D041NG )
Y a. 20220 N b. 20613 N c. 30219 N d. 32413 1015: Which statement about the time diagram shown is correct? (D005NG )
N a. The Greenwich hour angle of the Sun is greater than 180°. N b. The meridian angle of the Sun is labeled west. N c. The date of Greenwich is the day after the date for observer at M. Y d. The Sun has already passed the lower branch of the observer's meridian. 1018: An aneroid barometer reading should be corrected for differences in __________.
Y a. elevation N b. temperature N c. wind speed N d. latitude 1025: A first magnitude star is __________.
Y a. 2.5 times as bright as a second magnitude star N b. 3 times as bright as a second magnitude star N c. 5 times as bright as a second magnitude star N d. 10 times as bright as a second magnitude star 1085: A chart position enclosed by a semi-circle is a(n) __________.
N a. fix N b. estimated position Y c. dead reckoning position N d. running fix 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 1168: Which type of cloud is indicated by the number 4? (D039NG )
N a. Altocumulus N b. Cirrostratus N c. Cumulus Y d. Altostratus 1169: The symbols shown are used on radio facsimile weather charts. The symbol indicated at letter "O" represents __________. (D042NG )
Y a. sandstorms N b. thunderstorms N c. snow N d. rain showers 1275: How is variation indicated on a small-scale nautical chart?
N a. Magnetic compass table N b. Magnetic meridians Y c. Isogonic lines N d. Variation is not indicated on small-scale nautical charts. 1342: An occluded front on a weather map is colored __________.
N a. blue line Y b. purple line N c. dashed blue line N d. alternate red and blue line 1403: Which statement about the gyrocompass is FALSE?
Y a. Its accuracy remains the same at all latitudes. N b. It seeks the true meridian. N c. It can be used near the Earth's magnetic poles. N d. If an error exists, it is the same on all headings. 1417: Determine the first time after 1200 EST (ZD +5) when the velocity of the current will be 0.5 knot on 18 November 1983, at Marcus Hook, PA.
N a. 1221 N b. 1226 Y c. 1239 N d. 1312 1437: Determine the time after 0300 CST (ZD +6) when the velocity of the tidal current will be 0.5 knot on 16 April 1983, at Port Arthur Canal Entrance, TX.
N a. 0436 Y b. 0507 N c. 0538 N d. 0554 1456: The fog produced by warm moist air passing over a cold surface is called __________.
N a. conduction fog N b. radiation fog N c. frontal fog Y d. advection fog 1485: The safest and most prudent procedure to follow while navigating in the vicinity of a tropical cyclone is to __________.
Y a. take positive steps to avoid it if possible N b. batten down and prepare to ride out the storm N c. continue to navigate farther from the coast N d. always navigate towards the coast by the most direct route 1536: What will NOT induce errors into a Doppler sonar log?
Y a. Increased draft N b. Pitch N c. Roll N d. Change in trim 1561: You are sailing south on the Intracoastal Waterway (ICW) when you sight a red nun buoy with a yellow square painted on it. Which statement is TRUE?
N a. The buoy is off station and should be ignored as a navigational mark. N b. The waterway in that area has shoaled and the available depth of water is less than the project depth. N c. ICW traffic should not proceed beyond the buoy unless the crossing waterway is clear of all traffic. Y d. You should leave the buoy to port. 1579: You get underway from the oil terminal at Marcus Hook, PA, at 0815 ZT (ZD +5) on 20 February 1983, enroute to sea. You will be turning for 11 knots. What is the approximate current when you are abreast Reedy Island?
N a. Slack Y b. 2.0 knots ebbing N c. 1.5 knots flooding N d. 0.5 knot flooding 1663: What is the primary source of the earth's weather?
N a. The oceans N b. The moon Y c. The sun N d. The solar system 1740: If you are in the dangerous semicircle of a hurricane you can expect all of the following except __________.
Y a. backing winds N b. high seas N c. high winds N d. veering winds 1766: You are approaching a lock and see a flashing amber light located on the lock wall. You should __________.
N a. stand clear of the lock entrance Y b. approach the lock under full control N c. enter the lock as quickly as possible N d. hang off your tow on the lock wall 1816: A white buoy with an orange circle marked on it indicates __________.
N a. danger N b. vessels are excluded from the area N c. a mooring buoy Y d. operating restrictions are in effect 1869: The illustration represents a fixed C of E lock and dam. What navigational light(s) is(are) exhibited at the position indicated by the letter B in the illustration? (D036NG )
N a. One red light N b. Two green lights N c. Three green lights Y d. No light 1928: "Rotation" is the __________.
N a. wobbling of the Earth about its axis N b. motion of bodies in the solar system relative to the stars N c. motion of a celestial body in its orbit Y d. spinning of a celestial body about its axis 2022: The GP of a body for a high altitude sight is determined from the declination and the __________.
N a. right ascension N b. sidereal hour angle Y c. Greenwich hour angle N d. observed altitude 2099: 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. Y b. Continue on course until the range is closed, then alter course to the right. N c. Immediately alter course to the right to bring the range in line. N d. Immediately alter course to 309°T. 2382: What causes geocentric parallax?
N a. The varying distance between the Earth and Moon. Y b. The change in the Moon's position relative to the stars when viewed from the Earth's surface, as compared to the Earth's center. N c. The rapid change in declination of the Moon causes a rotational oscillation of its axis. N d. The nearness of the Moon causes an apparent increase in diameter as its altitude increases. 2409: You are approaching the first of two drawbridges that span a narrow channel. The second drawbridge is close to the first. Which signals should you sound?
N a. Sound the request-for-opening signal for the first bridge only, who will notify the second bridge of your approach N b. Sound the request-for-opening signal twice in succession to indicate you must pass through both bridges N c. Sound the request-for-opening signal, pause for about 10 seconds, then sound two prolonged blasts. Y d. Sound the request-for-opening signal and, after the bridge acknowledges it, sound the request-for-opening signal for the second bridge. 2409: You are approaching the first of two drawbridges that span a narrow channel. The second drawbridge is close to the first. Which signals should you sound?
N a. Sound the request-for-opening signal for the first bridge only, who will notify the second bridge of your approach N b. Sound the request-for-opening signal twice in succession to indicate you must pass through both bridges N c. Sound the request-for-opening signal, pause for about 10 seconds, then sound two prolonged blasts. Y d. Sound the request-for-opening signal and, after the bridge acknowledges it, sound the request-for-opening signal for the second bridge. 2426: You are in charge of a power-driven vessel crossing a river on the Western Rivers. You must keep out of the way of __________.
N a. a sail vessel descending the river N b. a power-driven vessel ascending the river N c. a vessel restricted in its ability to maneuver crossing the river Y d. All of the above 2567: When outbound from a U.S. port, a buoy displaying a flashing red light indicates __________.
N a. a sharp turn in the channel to the right N b. a wreck to be left on the vessel's starboard side N c. a junction with the preferred channel to the left Y d. the port side of the channel 2695: 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?
N a. The drift should be added to the ship's speed. N b. The current should be ignored. Y c. The course and speed made good should be determined and used to advance the LOP. N d. The set should be applied to the second bearing. 2778: A special daymark is a __________.
N a. red-and-white octagon N b. daymark with a yellow stripe on it N c. green square Y d. yellow diamond 2782: Your radar is set on a true motion display. Which of the following will appear to move across the PPI scope.
Y a. Own ship's marker N b. Echo from a ship at anchor N c. Echoes from land masses N d. All of the above 2832: The Light List indicates that a dayboard is a type MR. You should __________.
Y a. leave it on either side N b. look for the other dayboard forming the range N c. look for an all red daymark N d. check to enter the correct channel at this junction daymark 2940: On the Corps of Engineer's Navigation Maps, the channel is __________.
N a. midway between the banks N b. indicated by depths (in feet) Y c. indicated by a broken line N d. not indicated 2969: A red triangular daymark marks __________.
N a. the centerline of a navigable channel Y b. the starboard side of a channel N c. a prominent object of navigational interest that has no lateral significance N d. an area of a channel where passing another vessel is permitted 2990: In which source could you find the vertical clearance of a bridge on the Ohio River?
N a. Notice to Mariners Y b. Light List of the Mississippi River System N c. Great Lakes Pilot N d. Coast Pilot of the Gulf of Mexico 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° 3082: Which type of GPS receiver has at least four channels to process information from several satellites simultaneously?
N a. Sequential Y b. Continuous N c. Multiplex N d. None of the above