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.
25: You are in LONG 144°E. The date is 6 February, and the zone time is 0800. The Greenwich date and time are __________.
Y a. 2200, 5 February N b. 2300, 5 February N c. 1700, 6 February N d. 1800, 6 February 59: For navigational purposes, each great circle on the Earth has a length of __________.
N a. 3,600 miles N b. 5,400 miles N c. 12,500 miles Y d. 21,600 miles 80: When the moon is at first quarter or third quarter phase, what type of tides will occur?
N a. Apogean N b. Perigean Y c. Neap N d. Spring 85: Your longitude is 179°59'W. The LMT at this longitude is 23h 56m of the 4th day of the month. Six minutes later your position is 179°59'E longitude. Your LMT and date is now __________.
N a. 00h 02m on the 4th N b. 00h 02m on the 5th N c. 23h 50m on the 5th Y d. 00h 02m on the 6th 90: When the moon is new or full, which type of tides occur?
N a. Neap Y b. Spring N c. Diurnal N d. Apogean 139: What is the geographic longitude of a body whose GHA is 215°15'?
N a. 35°15'W N b. 35°15'E Y c. 144°45'E N d. 144°45'W 150: An alternating light __________.
N a. shows a light with varying lengths of the lighted period Y b. shows a light that changes color N c. marks an alternate lesser-used channel N d. is used as a replacement for another light 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 257: Spring tides occur __________.
N a. at the start of spring, when the Sun is nearly over the equator N b. only when the Sun and Moon are on the same side of the Earth and nearly in line N c. when the Sun and Moon are at approximately 90° to each other as seen from the Earth Y d. when the Sun, Moon, and Earth are nearly in line, in any order 355: During the month of October the Sun's declination is __________.
N a. north and increasing N b. north and decreasing Y c. south and increasing N d. south and decreasing 374: There are seven sources of error in the marine sextant. Of the four errors listed, which one is adjustable?
Y a. Error of collimation N b. Prismatic error N c. Graduation error N d. Centering error 418: In most cases, the direction of the apparent wind lies between the bow and __________.
Y a. the direction of the true wind N b. true north N c. the beam on the windward side N d. the beam on the lee side 431: When a buoy marks a channel bifurcation, the preferred channel is NOT indicated by __________.
N a. the shape of an unlighted buoy N b. the light color of a lighted buoy N c. the color of the topmost band Y d. whether the number is odd or even 441: A yellow buoy may exhibit a(n) __________.
N a. fixed red light Y b. flashing light N c. white light N d. occulting light 476: Tropical cyclones normally form within which of the following belts of latitude?
Y a. 5° to 15° N b. 15° to 30° N c. 30° to 45° N d. 45° to 60° 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) 584: The correction(s) which must be applied to an aneroid barometer reading include(s) __________.
Y a. height error N b. gravity error N c. temperature error N d. All of the above 599: Magnetic compass deviation __________.
N a. varies depending upon the bearing used Y b. is the angular difference between magnetic north and compass north N c. is published on the compass rose on most nautical charts N d. is the angular difference between geographic and magnetic meridians 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 711: In the IALA Maritime Buoyage System, a red and white vertically-striped buoy is used as a(n) __________.
Y a. safe water mark N b. cardinal mark N c. isolated danger mark N d. special mark not primarily used for navigation 784: Variation is the angular measurement between __________.
N a. compass north and magnetic north N b. compass north and true north Y c. magnetic meridian and the geographic meridian N d. your vessel's heading and the magnetic meridian 796: Cyclones tend to move __________.
N a. perpendicular to the isobars in their warm sectors Y b. parallel to the isobars in their warm sectors N c. parallel to the line of the cold front N d. perpendicular to the line of the cold front 799: In Region A of the IALA Buoyage System, when entering from seaward, the starboard side of a channel would be marked by a __________.
N a. green can buoy N b. red can buoy Y c. green conical buoy N d. red conical buoy 980: When the declination of the Moon is 0°12.5'S, you can expect some tidal currents in Gulf Coast ports to __________.
N a. have either a double ebb or a double flood Y b. become weak and variable N c. become reversing currents N d. exceed the predicted velocities 990: You plot a fix using three lines of position and find they intersect in a triangle. You should plot the position of the vessel __________.
N a. outside of the triangle N b. anywhere in the triangle N c. on the line of position from the nearest object, between the other two lines of position Y d. in the geometric center of the triangle 1081: On a voyage along the coast of France, you sight a buoy with the top marks as shown. You are required to steer __________. (D026NG )
N a. west of the buoy N b. east of the buoy Y c. south of the buoy N d. north of the buoy 1119: The position labeled "D" was plotted because __________. (D051NG )
N a. the vessel's speed changed at 1125 N b. a dead reckoning position is plotted within 30 minutes of a running fix Y c. a dead reckoning position is plotted for each course change N d. All of the above 1148: The numeral in the center of a wind rose circle on a pilot chart indicates the __________.
N a. total number of observations N b. average wind force on the Beaufort scale N c. average wind force in knots Y d. percentage of calms 1150: You are on course 312°T. To check the speed of your vessel you should observe a celestial body on which bearing?
Y a. 312° N b. 000° N c. 090° N d. 222° 1320: You are enroute to Savannah, GA, from Recife, Brazil. There is a strong N'ly wind blowing. As you cross the axis of the Gulf Stream you would expect to encounter __________.
Y a. steeper waves, closer together N b. smoother seas and warmer water N c. cirrus clouds N d. long swells 1344: Which of the buoy symbols shown indicates a safe water mark? (D032NG )
Y a. D N b. C N c. B N d. A 1366: Clouds appearing in the following order: cirrus, cirrostratus, altostratus, stratus, and nimbostratus usually indicate the approach of a(n) __________.
Y a. warm front N b. occluded front N c. medium front N d. cold front 1421: What is the approximate geographic visibility of an object with a height above the water of 70 feet, for an observer with a height of eye of 65 feet?
N a. 16.8 nm Y b. 19.0 nm N c. 20.6 nm N d. 22.4 nm 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 1453: Indications of the master gyrocompass are sent to remote repeaters by the __________.
N a. follow-up system Y b. transmitter N c. phantom element N d. azimuth motor 1466: Advection fog is most commonly caused by __________.
N a. air being warmed above the dew point N b. saturation of cold air by rain N c. a rapid cooling of the air near the surface of the Earth at night Y d. warm moist air being blown over a colder surface 1477: The wind in the vicinity of Nantucket Shoals Light has been southerly at an average speed of 23 knots. The predicted set and drift of the rotary tidal current are 225° at 0.8 knot. What are the set and drift of the current you can expect at Nantucket Shoals Light?
N a. 025° at 1.8 knots N b. 218° at 1.1 knots Y c. 235° at 0.5 knot N d. 247° at 0.7 knot 1481: What is the approximate geographic range of Fenwick Island Light, Delaware, if your height of eye is 42 feet (12.8 meters)? Refer to "Reprints from the LIGHT LISTS AND COAST PILOTS".
Y a. 18.3 nm N b. 15.4 nm N c. 13.1 nm N d. 10.3 nm 1498: A true bearing of a charted object, when plotted on a chart, will establish a __________.
N a. fix Y b. line of position N c. relative bearing N d. range 1583: The angle measured from the observer's meridian, clockwise or counterclockwise up to 180°, to the vertical circle of the body is the __________.
N a. local hour angle Y b. azimuth angle N c. meridian angle N d. observer's longitude 1662: Fog generally clears when the __________.
N a. wind speed increases N b. wind direction changes N c. temperature increases Y d. All of the above 1777: If the current and wind are in the same direction, the sea surface represents a wind speed __________.
Y a. lower than actually exists N b. higher than actually exists N c. that actually exists N d. that has no proportional relationship 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 1844: What is the relative bearing of an object sighted dead ahead?
N a. 180° N b. 090° N c. 015° Y d. 000° 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 1956: In the North Sea area, you sight a buoy showing a quick white light with 6 flashes, followed by one long flash at 15 second intervals. Which of the four topmarks shown would be fitted to this buoy? (D030NG )
Y a. A N b. B N c. C N d. D 1968: The Earth has the shape of a(n) __________.
N a. sphere Y b. oblate spheroid N c. spheroid of revolution N d. oblate eggoid 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 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° 2161: Yesterday your chronometer read 03h 01m 56s at the 1500 GMT time tick. Today your chronometer read 03h 01m 58s at the 1500 GMT time tick. What is the chronometer error?
N a. 03h 01m 58s fast Y b. 01m 58s fast N c. +2s N d. -2s 2254: A rock and sand structure extending from the bank of the river toward the channel is known as a __________.
Y a. wingdam N b. towhead N c. cutoff N d. landwall 2406: The dividing meridian between zone descriptions +4 and +5 is __________.
Y a. 67°30'W N b. 90°00'W N c. 67°30'E N d. 75°00'E 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° 2446: What is the equivalent of 47 min. 20 sec. in arc units?
N a. 8°27' Y b. 11°50' N c. 13°42' N d. 13°56' 2544: At McAlpine L & D, normal upper pool elevation is 420.0 feet MSL, equal to 12.0 feet on the upper gage. The vertical clearance at the Clark Memorial Highway bridge is 72.6 feet above normal pool. What is the clearance if the gage reads 27.2 feet?
N a. 25.4 feet Y b. 57.4 feet N c. 60.6 feet N d. 72.6 feet 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 2634: Under the U.S. Aids to Navigation System on the Western Rivers, a preferred-channel buoy is __________.
Y a. horizontally-banded red and green N b. vertically-striped red and white N c. solid red N d. solid green 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 2950: On an Army Corps of Engineers navigation map, each mile A.H.P. on the Lower Mississippi River is marked by a __________.
N a. dashed red line N b. number showing mileage N c. navigation light Y d. red circle 3070: The database information that should be shown when a chart is first displayed on ECDIS is the __________.
N a. display base information Y b. standard display information N c. system electronic nautical chart N d. chart display information