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.
104: What should you apply to a fathometer reading to determine the depth of water?
N a. Subtract the draft of the vessel. Y b. Add the draft of the vessel. N c. Subtract the sea water correction . N d. Add the sea water correction. 119: While proceeding along the Mediterranean coast of Spain, you sight the black and yellow buoy shown. Your course is 039°T, and the buoy bears 053°T. What action should you take? (D020NG )
N a. Alter course to 053°T and pass the buoy close aboard on either side N b. Alter course to 060° and ensure that the bearings decrease Y c. Maintain course and ensure that the bearings increase N d. Alter course towards the buoy and leave the buoy well clear on either side 137: Priming of the tides occurs __________.
N a. at times of new and full Moon N b. when the Earth, Moon, and Sun are lying approximately on the same line N c. when the Moon is between first quarter and full and between third quarter and new Y d. when the Moon is between new and first quarter and between full and third quarter 167: When the Moon's declination is maximum north, which of the following will occur?
N a. Mixed-type tides N b. Higher high tides and lower low tides Y c. Tropic tides N d. Equatorial tides 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 195: The equation of time is 8m 00s. The mean Sun is ahead of the apparent Sun. If you are 2°W of the central meridian of your time zone, when will the apparent Sun cross your meridian?
Y a. 1216 N b. 1208 N c. 1200 N d. 1152 249: When using GPS, how many theoretical position lines are required for a three-dimensional fix that takes into account altitude?
N a. 1 N b. 2 N c. 3 Y d. 4 416: A ship is on course 195° at a speed of 15 knots. The apparent wind is from 40° on the port bow, speed 30 knots. The direction and speed of the true wind are __________.
N a. 068°T, 30 knots Y b. 127°T, 21 knots N c. 263°T, 42 knots N d. 292°T, 42 knots 437: Your vessel will be docking at Chester, PA, during the evening of 22 April 1983. The chart shows a depth of 20 feet (6.1 meters) at the pier. What will be the depth of water available at 1856 EST (ZD +5)?
N a. 22.4 feet (6.8 meters) Y b. 23.4 feet (7.2 meters) N c. 24.9 feet (7.6 meters) N d. 25.7 feet (7.8 meters) 554: A sling psychrometer is a(n) __________.
N a. type of cargo gear N b. instrument used in celestial navigation Y c. instrument used to measure relative humidity N d. instrument used to measure specific gravity 574: If your mercurial barometer reads 30.50 inches (1033 millibars) and the temperature is 56°F (13°C), what is the correct reading at 55°N, 150°W?
N a. 30.42 inches (1030 millibars) Y b. 30.45 inches (1031 millibars) N c. 30.50 inches (1032 millibars) N d. 30.53 inches (1033 millibars) 617: You are bound for the Chelsea docks in the Hudson River. The Captain wants to arrive at the docks at the first slack water on 28 July 1983. You are keeping daylight saving time. What time should you be at the docks?
Y a. 0215 N b. 0530 N c. 0811 N d. 0911 654: 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?
N a. The generated CPA will be less than the actual CPA. N b. The generated TCPA will be later than the actual TCPA. N c. The range of initial target acquisition will be less than normal. Y d. The targets true course vector will be in error. 695: An azimuth angle for a body is measured from the __________.
Y a. observer's meridian N b. Greenwich meridian N c. body's meridian N d. zenith distance 708: Which statement about Radio Navigational Warning Broadcasts is TRUE?
N a. Radio navigational warnings are valid for 10 days, unless cancelled earlier. N b. NAVAREA warnings cover coastal areas only, while HYDROLANTS or HYDROPACS cover entire ocean areas. Y c. Radio navigational warnings issued by NGA (NIMA) are published in the Daily Memorandum and the Notice to Mariners. N d. HYDROLANTS and HYDROPACS cover the same geographical areas as NAVAREA warnings, but are for the use of military vessels only. 771: Under the IALA Buoyage Systems, a spherical buoy will mark the __________.
Y a. safe water N b. port side of the channel N c. a hazard to navigation N d. the position of an underwater cable 909: What is the average speed of movement of a hurricane prior to recurvature?
N a. 4 to 6 knots N b. 6 to 8 knots Y c. 10 to 12 knots N d. 15 to 20 knots 943: You should plot your dead reckoning position __________.
N a. when you obtain an estimated position N b. ONLY in piloting waters Y c. at every speed change N d. All of the above are correct. 953: The magnetic compass operates on the principle that __________.
N a. like magnetic poles attract N b. unlike magnetic poles repel Y c. unlike poles attract N d. the poles of the compass line up with the geographic poles of the earth 1089: You are enroute to assist vessel A. Vessel A is underway at 5.5 knots on course 033°T, and bears 248°T at 64 miles from you. What is the course to steer at 13 knots to intercept vessel A?
Y a. 262° N b. 269° N c. 276° N d. 281° 1105: The Light List shows that a navigational light has a nominal range of 22 miles and a height above water of 48 feet (14.6 meters). Your height of eye is 35 feet (10.7 meters) and the visibility is 20.0 miles. At what approximate range will you first sight the light?
N a. 10.5 nm N b. 13.2 nm Y c. 14.7 nm N d. 32.0 nm 1210: You are inbound in a channel marked by a range. The range line is 309°T. You are steering 306°T and have the range in sight as shown. The range continues to open. What action should you take? (D047NG )
N a. Alter course to the right to 309°T or more to bring the range in line. N b. Maintain course as it is normal for the range to open as you get close. Y c. Alter course to the left until the range closes, then steer to the left of 306°T. N d. Alter course to the left to close the range, then alter course to 309°T. 1219: Which sextant in illustration D043NG reads 29°42.5'? (D043NG )
N a. A N b. B N c. C Y d. D 1268: On a nautical chart, the inner ring of a compass rose indicates __________.
N a. true directions N b. compass error N c. deviation Y d. magnetic directions 1278: The difference between the heights of low and high tide is the __________.
N a. depth N b. distance Y c. range N d. period 1426: Fog is most commonly associated with a(n) __________.
Y a. warm front at night N b. low pressure area N c. anticyclone N d. cold front in the spring 1433: A system of reservoirs and connecting tubes in a gyro compass is called a __________.
N a. spider element Y b. mercury ballistic N c. gyrotron N d. rotor 1446: When compared to air temperature, which factor is most useful in predicting fog?
N a. Vapor pressure Y b. Dew point N c. Barometric pressure N d. Absolute humidity 1484: You should plot your dead reckoning position at __________.
N a. every fix or running fix N b. every course change N c. every speed change Y d. All of the above are correct. 1529: Widely spaced isobars on a weather map indicate __________.
N a. high winds Y b. gentle breezes N c. ice, snow or frozen rain N d. probability of tornados 1530: In shallow water, waves that are too steep to be stable, causing the crests to move forward faster than the rest of the wave, are called __________.
N a. rollers Y b. breakers N c. white caps N d. surfers 1538: The winds of the "roaring forties" are strongest near __________.
N a. 40°N N b. 50°N N c. 40°S Y d. 50°S 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 1566: The illustration shows the symbols used on radio facsimile weather charts. Which of these symbols indicates thunderstorms? (D042NG )
Y a. I N b. K N c. L N d. M 1610: When the navigational channel passes under a fixed bridge, the edges of the channel are marked on the bridge with what lights?
Y a. Red lights N b. Three white lights in a vertical line N c. Red lights on the LDB and green lights on the RDB N d. Yellow lights 1722: Hurricanes may move in any direction. However, it is rare and generally of short duration when a hurricane in the Northern Hemisphere moves toward the __________.
N a. west or northwest N b. northeast Y c. southeast N d. north 1789: 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 F in the illustration? (D036NG )
Y a. One red light N b. Two green lights N c. Three green lights N d. No light(s) 1812: The line of position should be plotted as a circle around the GP of the body when the Ho exceeds what minimum value?
N a. 80° N b. 83° N c. 85° Y d. 87° 1842: What is the major problem with taking high altitude observations?
N a. Possible errors due to unusual refraction may exist. N b. The tables are not as accurate due to inherent errors in the spherical triangle at high altitudes. N c. Rapidly changing altitudes make it difficult to get an accurate altitude. Y d. It is difficult to establish the point where the sextant is vertical to the horizon. 1890: A vessel heading SSE is on a course of __________.
N a. 112.5° N b. 135.0° Y c. 157.5° N d. 180.0° 1930: The phase correction should be applied to sights of Venus and Mars __________.
N a. during day time observations only Y b. during twilight observations only N c. at all times N d. when observed at altitudes of less than 25° 2016: Which statement about the Flinders bar of the magnetic compass is CORRECT?
Y a. It compensates for the error caused by the vertical component of the Earth's magnetic field. N b. It compensates for error caused by the heeling of a vessel. N c. It compensates for quadrantal deviation. N d. It is only needed in equatorial waters. 2125: On charts of U.S. waters, a magenta marking is NOT used for marking a __________.
N a. radio beacon N b. lighted buoy Y c. 5-fathom curve N d. prohibited area 2143: What lights would you see on the Illinois water way when any wickets of the dam or bear traps are open, or partially open, which may cause a set in the current conditions in the upper lock approach?
Y a. Red over amber (yellow) N b. Green over amber (yellow) N c. Red over Green N d. Green over Red 2237: A lighted buoy to be left to starboard, when entering a U.S. port from seaward, shall have a __________.
N a. light characteristic of Morse (A) N b. white light N c. green light Y d. red light 2271: What is the definition of height of tide?
N a. The vertical distance from the surface of the water to the ocean floor Y b. The vertical distance from the tidal datum to the level of the water at any time N c. The vertical difference between a datum plane and the ocean bottom N d. The vertical difference between the heights of low and high water 2279: Antares is found in what constellation?
Y a. Scorpio N b. Corvus N c. Libra N d. Corona Borealis 2374: The largest of the navigational planets is __________.
N a. Mars N b. Venus Y c. Jupiter N d. Saturn 2397: The letter D in illustration D006NG represents the __________.
N a. sensible horizon N b. celestial horizon N c. visible horizon Y d. geometrical horizon 2442: You have completed the magnetic compass adjustments on magnetic east and magnetic south. The vessel is now steady on magnetic north but the compass reads 004°. You should now adjust the compass until it reads __________.
N a. 356° N b. 358° N c. 000° Y d. 002° 2470: You are on course 344°T and take a relative bearing of a lighthouse of 090°. What is the true bearing to the lighthouse?
N a. 016° Y b. 074° N c. 254° N d. 270° 2594: At McAlpine L & D, normal upper pool elevation is 420.0 feet (130.8 meters) MSL, equal to 12.0 feet (3.7 meters) on the upper gage. The vertical clearance at the Clark Memorial Highway bridge is 72.6 feet (22.1 meters) above normal pool. What is the clearance if the gage reads 10.6 feet (3.2 meters)?
N a. 84.6 feet (25.8 meters) N b. 83.2 feet (25.4 meters) Y c. 74.0 feet (22.6 meters) N d. 62.0 feet (18.9 meters) 2752: A daymark used to indicate the safe water in a channel will have which of the shapes shown? (D045NG )
N a. A N b. B Y c. C N d. D 2752: A daymark used to indicate the safe water in a channel will have which of the shapes shown? (D045NG )
N a. A N b. B Y c. C N d. D 2824: When you turn on the fast time constant (differentiator) control of a radar it will __________.
N a. enhance weak target echoes and brighten them on the PPI Y b. reduce clutter over the entire PPI by shortening the echoes N c. only suppress weak targets to a limited distance from the ship (sea clutter) N d. reduce the beam width to provide a map-like presentation for navigation 2890: While passing through Memphis, the weather report on the TV news indicates that a cold front is crossing western Kentucky and Tennessee. Tomorrow's weather will be dominated by a high pressure area. What weather should you expect tomorrow?
N a. Light, southerly winds; high humidity and possibly fog Y b. Moderate winds from the northwest, clear visibility and cooler temperatures N c. Low overcast; mild temperatures with light, steady rain or drizzle N d. Scattered clouds with light, southeasterly winds; high humidity and possibly fog 2902: The direction a vessel is pointed at any given time is the __________.
N a. course N b. track Y c. heading N d. course over the ground 2972: You are in a channel inbound from sea. A daymark used to mark a channel junction when the preferred channel is to starboard will have the shape indicated by what letter in illustration D045NG?
Y a. A N b. B N c. C N d. D 3036: Which daymark has no lateral significance?
N a. Square; top half green and bottom half red Y b. Black and white diamond N c. Red triangle N d. Green square 3118: With respect to automatic identification systems (AIS), which information is required to be broadcast every 1 to 10 seconds?
N a. Call sign and IMO number Y b. Course over ground and MMSI N c. MMSI number and call sign N d. Route Plan and navigational status