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.
13: Most modern Loran-C receivers, when not tracking properly, have a(n) __________.
N a. bell alarm to warn the user Y b. lighted alarm signal to warn the user N c. alternate signal keying system N d. view finder for each station 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. 120: You are underway on course 050°T and your maximum speed is 13 knots. The eye of a hurricane bears 100°T, 120 miles from your position. The hurricane is moving towards 275°T at 25 knots. If you maneuver at 13 knots to avoid the hurricane, what could be the maximum CPA?
Y a. 72 miles N b. 78 miles N c. 83 miles N d. 89 miles 159: The apparent wind can be zero when the true wind is from __________.
N a. ahead and equal to the ship's speed Y b. astern and equal to the ship's speed N c. ahead and equal to twice the ship's speed N d. astern and equal to twice the ship's speed 220: At 0000 you fix your position and plot a new DR track line. At 0200 you again fix your position and it is 0.5 mile east of your DR. Which statement is TRUE?
N a. The current is westerly at 0.5 knot. N b. You must increase speed to compensate for the current. N c. The current cannot be determined. Y d. The drift is 0.25 knot. 253: Loran-C is which type of system?
N a. Reflected electron N b. Electrical radiation N c. Quarterpoint electrical navigation Y d. Hyperbolic radio navigation 255: On March 17, at 0500 zone time, you cross the 180th meridian steaming eastward to west longitude. What is your local time?
N a. You are in -12 time zone. N b. It is 1700, March 18. Y c. It is 0500, March 16. N d. It is 0500, March 18. 293: The use of pulse groups and extremely precise timing at each Loran-C station makes possible the use of __________.
N a. high frequency pulses N b. combinations of high and low frequency pulses Y c. the same frequency for all stations in a chain N d. varied long and short pulses 483: Coral atolls, or a chain of islands at right angles to the radar beam, may show as a long line rather than as individual targets due to __________.
Y a. the effects of beam width N b. limitations on range resolution N c. the pulse length of the radar N d. the multiple-target resolution factor 541: A yellow buoy may mark a(n) __________.
N a. wreck N b. shoal area Y c. anchorage area N d. middle ground 542: The only cylindrical chart projection widely used for navigation is the __________.
N a. Lambert conformal Y b. Mercator N c. azimuthal N d. gnomonic 594: Barometers are calibrated at a standard temperature of __________.
N a. 0°F Y b. 32°F N c. 60°F N d. 70°F 645: The arc of an hour circle between the celestial equator and a point on the celestial sphere, measured northward or southward through 90°, is the __________.
N a. altitude Y b. declination N c. latitude N d. azimuth angle 665: 17 degrees of latitude is equal to __________.
N a. 68 miles N b. 510 miles Y c. 1020 miles N d. 4080 miles 748: You are steaming west in the South Atlantic in an extratropical cyclonic storm, and the wind is dead ahead. According to the law of Buys Ballot, the center of low pressure lies __________.
N a. to the north of you Y b. to the south of you N c. dead ahead of you N d. dead astern of you 779: Which sextant shown has an index error of 0'20" on the arc? (D050NG )
N a. A N b. B Y c. C N d. D 787: You are on a voyage from New Orleans to Boston. When navigating off the Florida coast, you will get the greatest benefit from the Gulf Stream if you navigate __________.
Y a. about 45 miles east of Cape Canaveral N b. about 25 miles east of Daytona Beach N c. along the 50-fathom curve N d. close inshore between Fowey Rocks and Jupiter Inlet 837: The Brazil Current flows in which general direction?
N a. Northwesterly Y b. Southwesterly N c. Southeasterly N d. Northerly 869: Tropical storms and hurricanes are most likely to form in the Southern hemisphere during __________.
Y a. January through March N b. April through May N c. June through August N d. September through November 888: Recurvature of a hurricane's track usually results in the forward speed __________.
Y a. increasing N b. decreasing N c. remaining the same N d. varying during the day 916: Stormy weather is usually associated with regions of __________.
Y a. low barometric pressure N b. high barometric pressure N c. steady barometric pressure N d. changing barometric pressure 954: A thin, whitish, high cloud popularly known as "mares' tails" is __________.
N a. altostratus N b. stratus N c. cumulus Y d. cirrus 983: Error may be introduced into a magnetic compass by __________.
N a. making a structural change to the vessel N b. a short circuit near the compass N c. belt buckles Y d. All of the above 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% 1140: What is the light characteristic of a lighted, preferred-channel buoy?
N a. Group flashing Y b. Composite group flashing N c. Interrupted quick flashing N d. Fixed and flashing 1152: When using GPS without Selective Availability, you may expect your horizontal accuracy to be better than __________.
N a. 3 meters Y b. 20 meters N c. 100 meters N d. 200 meters 1159: Two navigational hazards are located near to each other, but each is marked by an individual cardinal buoyage system. The buoys of one cardinal system may be identified from the other system by __________.
N a. the differing light colors N b. one system having odd numbers while the other system has even numbers N c. one system using horizontal bands while the other system uses vertical stripes Y d. the difference in the periods of the light 1289: A body can only be observed at lower transit when __________.
N a. the declination is the opposite name to the latitude N b. the algebraic sum of the colatitude and declination exceeds 90° N c. the observer is in high latitudes above either polar circle Y d. the body is circumpolar 1357: You will transit the Cape Cod Canal on 7 November 1983. If you arrive at the R R Bridge at 1655 EST (ZD +5), for what period of time during your transit will you have currents of not more than 0.5 knot?
N a. 1631 to 1719 N b. 1638 to 1655 Y c. 1648 to 1702 N d. 1655 to 1709 1444: Stratocumulus clouds are indicated by which number? (D039NG )
N a. 1 N b. 4 Y c. 6 N d. 7 1461: The chart indicates the variation was 3°45'W in 1988, and the annual change is decreasing 6'. If you use the chart in 1991 how much variation should you apply?
Y a. 3°27'W N b. 3°27'E N c. 4°03'W N d. 4°03'E 1620: You are at anchor in the anchorage at the entrance to Delaware Bay. If you weigh anchor at 1445 DST (ZD +4) on 24 July 1983 and proceed northbound enroute to Philadelphia at a speed of 10 knots, you will have __________.
N a. a flood current the entire trip N b. a flood current from Ship John Shoal Lt. to Philadelphia N c. an ebb current north of New Castle, DE Y d. a weak flood between Reedy Island and Edgemoor 1641: The low, dark, sheet-like cloud which is associated with continuous precipitation for many hours is a __________.
N a. cirrus cloud N b. cumulus cloud N c. cumulonimbus cloud Y d. nimbostratus cloud 1737: You can determine if your vessel's position is in the dangerous or navigable semicircle of a hurricane by __________.
N a. observing whether the wind is veering or backing N b. plotting two or more recent storm positions from weather bulletins Y c. Both A and B N d. Neither A nor B 1770: A Doppler speed log indicates speed over ground __________.
N a. at all times Y b. in the bottom return mode N c. in the volume reverberation mode N d. only when there is no current 1776: A vessel operating on the Great Lakes, and whose position is southeast of an eastward-moving storm center, would NOT experience __________.
N a. a falling barometer N b. lowering clouds and drizzle Y c. a northeast wind N d. rain or snow 1787: What indicates that a tropical cyclone may be within 500 to 1,000 miles of your position?
Y a. A pumping of the barometer up and down a few millibars N b. A sudden wind shift from southwest to northwest followed by steadily increasing winds N c. The normal swell pattern becoming confused, with the length of the swell increasing N d. An overcast sky with steadily increasing rain from nimbostratus clouds 1809: What occurs when rising air cools to the dew point?
N a. Advection fog forms N b. Humidity decreases N c. Winds increase Y d. Clouds form 1859: While proceeding downriver (descending) you sight a red diamond-shaped panel with small, red reflector squares in each corner on the left bank. Under the U.S. Aids to Navigation System on the Western Rivers this is a __________.
N a. special purpose signal N b. passing daymark Y c. crossing daymark N d. cable crossing 1900: A parallax correction is NOT applied to observations of the __________.
Y a. stars N b. Moon N c. Sun N d. Planets 1923: Little or no change in the barometric reading over a twelve hour period indicates __________.
N a. stormy weather is imminent Y b. that present weather conditions will continue N c. a defect in the barometer N d. increasing wind strength 2000: A vessel heading SE is on a course of __________.
N a. 112.5° Y b. 135.0° N c. 157.5° N d. 180.0° 2006: What is the relative bearing of an object broad on the port beam?
N a. 315° N b. 300° Y c. 270° N d. 235° 2007: Information about the direction and velocity of rotary tidal currents is found in the __________.
N a. Mariner's Guide Y b. Tidal Current Tables N c. Nautical Almanac N d. Tide Tables 2176: The illustration represents a movable dam. If there is high water and the wickets are down so that there is an unobstructed navigable pass through the dam, what light(s) will be shown at D if the lock walls and piers are not awash? (D037NG )
N a. Three red lights N b. Two red lights Y c. One red light N d. One amber light 2262: The Milky Way is an example of a __________.
N a. cluster Y b. galaxy N c. nova N d. nebula 2364: The immediate surroundings of what constellation contain the most first magnitude stars?
N a. Libra N b. Cassiopeia N c. Pegasus Y d. Orion 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 2437: When daylight savings time is kept, the times of tide and current calculations must be adjusted. One way of doing this is to __________.
N a. add 15° to the standard meridian when calculating the time differences N b. apply no correction as the times at the reference stations are adjusted for daylight savings time Y c. add one hour to the times listed for the reference stations N d. subtract one hour from the times listed for the subordinate stations 2469: A tow that is properly aligned to pass through a narrow opening between two bridge piers is "________________".
N a. on course N b. headed fair N c. holding on Y d. in shape 2514: Sidereal time is NOT used __________.
N a. as the basis for star charts N b. to enter a star finder N c. in sight reduction using Pub 249 Y d. in sight reductions of planet observations 2606: The measurement of local time is based on the passage of the Sun over the __________.
N a. upper branch of the observer's meridian Y b. lower branch of the observer's meridian N c. upper branch of the Greenwich meridian N d. lower branch of the Greenwich meridian 2625: Stormy weather is usually associated with regions of __________.
N a. high barometric pressure N b. changing barometric pressure Y c. low barometric pressure N d. steady barometric pressure 2644: The sidereal day begins __________.
N a. when the sun is over the first point of Aries N b. when the first point of Aries is over 180° longitude Y c. when the first point of Aries is over the upper branch of the reference meridian N d. at 0000 on 1 January (Sidereal Date) 2744: The standard atmospheric pressure measured in inches of mercury is __________.
Y a. 29.92 N b. 500.0 N c. 760.0 N d. 1013.2 2846: Which type of daymark is used to mark the port side of the channel when entering from sea?
N a. Red and white octagon N b. Black and white diamond N c. Red triangle Y d. Green square 2876: On 13 November 1981 you observe a back sight of the lower limb of the Sun. The sextant altitude (hs) is 109°23.6'. The height of eye is 66 feet, and the index error is 2.0' off the arc. What is the observed altitude (Ho)?
N a. 71°01.2' Y b. 70°57.2' N c. 70°45.4 N d. 70°26.4' 2925: A single line of position combined with a dead-reckoning position results in a(n) __________.
N a. running fix N b. fix N c. assumed position Y d. estimated position 3026: A compass card without north-seeking capability that is used for relative bearings is a(n) __________.
N a. bearing circle Y b. pelorus N c. bearing bar N d. alidade 3083: Which theoretical minimum number of measurements from satellites does a GPS receiver need in order to provide an exact three-dimensional position?
N a. Five Y b. Four N c. Three N d. Two