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.
40: 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 1600 and turn for 8 knots, at what point will you lose the ebb current?
N a. Billingsport N b. Marcus Hook Y c. Mile 63 N d. Mile 52 137: 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 186: In the doldrums you will NOT have __________.
N a. high relative humidity N b. frequent showers and thunderstorms Y c. steep pressure gradients N d. frequent calms 204: Because of the reflecting properties of a sextant, if the sextant altitude reads 60° on the limb, the actual arc of the limb from 0° to the 60° reading is __________.
N a. 20° Y b. 30° N c. 40° N d. 60° 235: When the equation of time is taken from the Nautical Almanac for use in celestial navigation, it is used to determine __________.
N a. zone time N b. sunrise Y c. time of local apparent noon N d. local mean time 243: The loran lines drawn on navigation charts represent __________.
Y a. ground waves N b. skywaves N c. either ground waves or skywaves interchangeably N d. an average between ground wave and skywave positions 320: Sometimes foreign charts are reproduced by NGA (NIMA). On such a chart, a wire-dragged, swept area may be shown in green or __________.
N a. red N b. black Y c. purple N d. yellow 361: As your vessel is heading southward along the east coast of the United States, you encounter a buoy showing a red flashing light. How should you pass this buoy?
N a. Pass it about 50 yards off on either side. Y b. Leave it to your starboard. N c. Leave it to your port. N d. Pass it well clear on either side. 371: Which buoy may be odd numbered?
N a. Mid-channel buoy N b. Unlighted nun buoy Y c. Lighted green buoy N d. All of the above 381: A nun buoy will __________.
N a. be green in color Y b. have an even number N c. be left to port when entering from seaward N d. be cylindrical in shape 442: In very high latitudes, the most practical chart projection is the __________.
N a. Mercator N b. gnomonic N c. azimuthal Y d. Lambert conformal 570: Chart legends printed in capital letters show that the associated landmark is __________.
N a. inconspicuous Y b. conspicuous N c. a government facility or station N d. a radio transmitter 573: What is the name of the movable, radial guide line used to measure direction on a radar?
N a. Compass rose Y b. Cursor N c. Plan position indicator N d. Variable range marker 686: The pressure gradient between the horse latitudes and doldrums runs __________.
N a. east to west Y b. north to south N c. northeast to southwest N d. northwest to southeast 716: Standard atmospheric pressure in inches of mercury is __________.
N a. 30.00 N b. 28.92 Y c. 29.92 N d. 29.00 736: A line on a weather chart connecting places which have the same barometric pressure is called an __________.
N a. isotherm N b. isallobar Y c. isobar N d. isotope 740: A very light breeze that causes ripples on a small area of still water is a __________.
Y a. cat's paw N b. hog's breath N c. williwaw N d. chinook 803: Which buoy will NOT display white retroreflective material?
N a. Safe water mark N b. Isolated danger mark Y c. Preferred channel mark N d. Daymark of no lateral significance 841: Under the IALA-A Buoyage system, a buoy marking the port hand of the channel when approaching from seaward may NOT have a __________.
N a. red light Y b. conical shape N c. group-flashing light N d. square topmark 863: The compass heading of a vessel differs from the true heading by __________.
Y a. compass error N b. variation N c. magnetic dip N d. deviation 897: What current flows southward along the west coast of the United States and causes extensive fog in that area?
N a. Davidson Current N b. North Pacific Current N c. Alaska Current Y d. California Current 903: Eight points of a compass are equal to how many degrees?
N a. 45 Y b. 90 N c. 180 N d. 360 922: How is the intensity of a light expressed in the Light Lists?
N a. Luminous range N b. Geographic range Y c. Nominal range N d. Meteorological range 954: A thin, whitish, high cloud popularly known as "mares' tails" is __________.
N a. altostratus N b. stratus N c. cumulus Y d. cirrus 985: A time diagram is a diagram on the plane of the __________.
N a. celestial meridian Y b. celestial equator N c. celestial horizon N d. principal vertical circle 993: When crossing the magnetic equator the __________.
N a. Flinders bar should be inverted Y b. heeling magnet should be inverted N c. the quadrantal spheres should be rotated 180° N d. Flinders bar should be moved to the opposite side of the binnacle 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 1095: The celestial coordinate of a star that is relatively constant in value is the __________.
N a. Greenwich hour angle N b. local hour angle Y c. sidereal hour angle N d. meridian angle 1109: You are on course 146°T. To check the speed of your vessel you should observe a celestial body on which bearing?
N a. 000° N b. 056° N c. 090° Y d. 146° 1171: A light that has a light period shorter than its dark period is described as __________.
Y a. flashing N b. pulsating N c. occulting N d. alternating 1246: What weather change accompanies the passage of a cold front in the Northern Hemisphere?
N a. Wind shift from northeast clockwise to southwest N b. Steady dropping of barometric pressure N c. Steady precipitation, gradually increasing in intensity Y d. A line of cumulonimbus clouds 1280: A current perpendicular to a vessel's track has the greatest effect on the vessel's course made good __________.
N a. at high vessel speeds Y b. at low vessel speeds N c. in shallow water N d. in deep water 1285: 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 time to intercept if you make 13 knots?
N a. 4h 55m N b. 4h 36m N c. 3h 59m Y d. 3h 44m 1337: What will be the time of maximum flood current at Sagamore Bridge on the Cape Cod Canal during the morning of 6 December 1983 (ZD +5)?
Y a. 0708 N b. 0712 N c. 0716 N d. 1020 1360: Which type of cloud is composed entirely of ice crystals and is found at very high altitudes?
N a. Cumulus Y b. Cirrus N c. Stratus N d. Nimbostratus 1470: The Illustration shows the symbols used on radio facsimile weather charts. Which symbol indicates a hurricane? (D042NG )
N a. M N b. I N c. L Y d. K 1509: Your facsimile prognostic chart indicates that you will cross the cold front of a low pressure system in about 24 hours. You should __________.
N a. expect to see cirrus clouds followed by altostratus and nimbostratus clouds N b. alter course to remain in the navigable semicircle Y c. prepare for gusty winds, thunderstorms, and a sudden wind shift N d. expect clear weather, with steady winds and pressure, until the front passes 1586: A green buoy has a yellow triangle on it. This is a(n) __________.
N a. information or regulatory buoy that has lateral significance N b. buoy that is off-station and is marked to warn mariners of its wrong position Y c. dual purpose marking used where the ICW and other waterways coincide N d. buoy that was set in error and will be replaced with a red nun buoy 1599: The time interval between successive wave crests is called the __________.
N a. trough Y b. period N c. frequency N d. epoch 1635: An isotherm is __________.
N a. a line on a weather map connecting equal points of both temperature and pressure N b. an instrument that measures the climatological effects of temperature N c. a line connecting points of equal barometric pressure on a weather map Y d. a line connecting points of equal temperature on a weather map 1682: Which of the listed properties does warm air possess?
N a. It rises above cooler air and cools as it rises. N b. Atmospheric pressure drops as warm air rises. N c. Moisture in warm air condenses as the air is cooled. Y d. All of the above 1735: A vessel entering the eye of a hurricane should expect __________.
N a. moderating winds and heavy confused seas to strike his vessel from all directions N b. the winds to increase to hurricane force and strike from a different direction as the eye passes N c. the barometer to reach the lowest point Y d. All of the above 1794: Why are low altitude sun sights not generally used?
Y a. Errors due to unusual refraction may exist. N b. Sextants may have large errors at small angles of elevation. N c. Modern sight reduction tables are not complete for low altitudes below 5°. N d. The glare on the horizon causes irradiation errors. 1800: In order to insure that a RACON signal is displayed on the radar, you should __________.
N a. increase the brilliance of the PPI scope Y b. turn off the interference controls on the radar N c. use the maximum available range setting N d. increase the radar signal output 1908: What is the brightest navigational planet?
N a. Saturn N b. Jupiter N c. Mars Y d. Venus 1989: In the horizon system of coordinates what is the equivalent to the meridians on the Earth?
N a. Horizon N b. Hour circle Y c. Vertical circles N d. Celestial meridians 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 2008: What term is used to describe a tank barge constructed with the structural framing outside the cargo tank and the cargo tank plating separated from the shell plating?
N a. Shell plated Y b. Double hull N c. Hopper type N d. Independent tank 2058: Illustration D038NG represents a fixed C of E lock and dam. What navigational light(s) is(are) exhibited at the position indicated by the letter D in the illustration? (D038NG )
N a. One red light N b. Two green lights Y c. Three green lights N d. No lights 2128: Diagram number D037NG 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 B if the lock walls and piers are not awash?
Y a. Three red lights N b. Two red lights N c. One red lights N d. No lights 2163: The letter C in illustration D006NG represents the __________.
N a. visible horizon N b. geoidal horizon Y c. celestial horizon N d. sensible horizon 2344: The Moon is subject to four types of libration. Which of the following is NOT one of these types of libration?
N a. Libration in latitude N b. Diurnal libration N c. Physical libration Y d. Horizontal libration 2422: The dimmest stars that could be reasonably used for navigational purposes are of what magnitude?
N a. First Y b. Third N c. Sixth N d. Tenth 2440: You are on course 357°T and take a relative bearing of a lighthouse of 180°. What is the true bearing to the lighthouse?
N a. 003° N b. 227° Y c. 177° N d. 363° 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° 2504: Under the IALA-A Buoyage System, when entering from seaward a lateral system buoy to be left to starboard may display which topmark shown? (D046NG )
N a. A N b. B Y c. C N d. D 2596: The abbreviation L.W.R.P. on the navigation maps means __________.
Y a. low water reference plane N b. low winter runoff point N c. least water river plane N d. land wall reference point 2739: A daymark used to indicate the starboard side of the channel when approaching from seaward will have the shape indicated by what letter in illustration D045NG?
N a. A N b. B N c. C Y d. D 2831: A coastal chart could have a scale of __________.
N a. not more than 1:25,000 N b. 1:35,000 Y c. 1:100,000 N d. 1:500,000 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