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.
107: The average height of the surface of the sea for all stages of the tide over a 19 year period is called __________.
N a. mean high water N b. mean low water N c. half-tide level Y d. mean sea level 111: Green lights may appear on __________.
Y a. horizontally banded buoys N b. vertically striped buoys N c. yellow buoys N d. spherical buoys 116: Which wind results from a land mass cooling more quickly at night than an adjacent water area?
N a. Coastal breeze N b. Sea breeze Y c. Land breeze N d. Mistral 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 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 302: Which symbol represents a 20-fathom curve?
Y a. -..-..-..-..- N b. - - - - - - - - N c. - - . - - . - - . - - . N d. - - - - - - - - 360: The Illustration shows the symbols used on radio facsimile weather charts. The symbol indicated at letter "M" represents __________. (D042NG )
N a. rain Y b. snow N c. hail N d. ice 377: Determine the height of the tide at 2045 EST (ZD +5) at Augusta, ME, on 8 March 1983.
N a. 1.4 feet (0.5 meter) Y b. 1.9 feet (0.6 meter) N c. 2.3 feet (0.7 meter) N d. 2.6 feet (0.8 meter) 384: Which is a nonadjustable error of the sextant?
N a. Error of perpendicularity N b. Side error N c. Error of collimation Y d. Centering error 434: The purpose of the "set" hand on an aneroid barometer is to __________.
N a. adjust the barometer Y b. indicate any change in the reading of the barometer N c. provide a correction for height above sea level N d. provide a correction for temperature changes 448: Mean high water is the reference datum used to measure __________.
N a. soundings on the east coast of the United States N b. soundings in European waters Y c. heights of topographical features in the United States N d. both heights and soundings worldwide 524: An anemometer on a moving vessel measures __________.
Y a. apparent wind speed only N b. true wind speed and true wind direction N c. true wind speed only N d. apparent wind speed and true wind direction 613: Your radar indicates a target; however, there is no visible object at the point indicated. A large mountain, approximately 50 miles away on the same bearing as the target, is breaking the horizon. You should suspect the radar target is caused by __________.
N a. a submerged submarine Y b. ducting N c. sub-refraction N d. ionospheric skip waves 684: The ARPA may swap targets when automatically tracking if two targets __________.
N a. are tracked on reciprocal bearings N b. are tracked at the same range N c. are tracked on the same bearing Y d. pass close together 698: You are in LONG 165°E, zone time at 0400, 1 November 1981. What is the zone time and date in LONG 165°W?
Y a. 0600, 31 October N b. 1800, 31 October N c. 1800, 1 November N d. 0600, 1 November 714: When using the ARPA in heavy rain, which action should you take?
N a. Increase the radar gain to pick up weak echoes through the rain. N b. Increase the STC setting to reduce close-in spurious signals. Y c. Navigate as though the effective range of the radar has been reduced. N d. Increase the range of the inner and outer guard rings. 830: The highest frequency of tropical cyclones in the North Atlantic Ocean occurs during __________.
N a. January, February and March N b. April, May and June Y c. August, September and October N d. July, November and December 854: The appearance of nimbostratus clouds in the immediate vicinity of a ship at sea would be accompanied by which of the following conditions?
Y a. Rain and poor visibility N b. Dropping barometric pressure and backing wind in the Northern Hemisphere N c. High winds and rising sea N d. Severe thunderstorms 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 874: Altocumulus clouds are defined as __________.
N a. high clouds Y b. middle clouds N c. low clouds N d. vertical development clouds 884: Which cloud type is normally associated with thunderstorms?
N a. Cirrus N b. Stratus N c. Cumulus Y d. Cumulonimbus 954: A thin, whitish, high cloud popularly known as "mares' tails" is __________.
N a. altostratus N b. stratus N c. cumulus Y d. cirrus 989: The Light List shows that a navigational light has a nominal range of 18 miles and a height above water of 22 feet (6.7 meters). Your height of eye is 16 feet (4.9 meters) and the visibility is 2.0 miles. At which approximate range will you first sight the light?
N a. 2.0 miles N b. 2.7 miles N c. 4.2 miles Y d. 5.8 miles 1039: While taking weather observations, you determine that the wind is coming from the west. In the weather log, you would record the wind direction as __________.
N a. 000° N b. 090° N c. 180° Y d. 270° 1131: On navigational aids, what does the light characteristic "Fl(2+1)" mean?
N a. A flashing light combined with a fixed light of greater brightness Y b. Light flashes combined in groups, with a different number of flashes in each group N c. A light showing groups of two or more flashes at regular intervals N d. A fixed light varied at regular intervals by groups of two or more flashes of greater brightness 1227: What will be the direction and velocity of the tidal current at Provincetown Harbor, MA, at 1405 DST (ZD +4) on 5 May 1983?
N a. 0.0 knot at 135°T N b. 0.2 knot at 135°T Y c. 0.4 knot at 315°T N d. 0.6 knot at 315°T 1231: Some lights used as aids to marine navigation have a red sector to indicate a danger area. How are the limits of a colored sector of light listed in the Light List?
N a. Geographical positions outlining the area of the sector N b. True bearings as observed from the light toward a vessel Y c. True bearings as observed from a vessel toward the light N d. Bearings given in the Light List are always magnetic 1238: What will be the height of tide at Three Mile Harbor Entrance, Gardiners Bay, NY, at 0700 (ZD +5) on 14 Nov 1983?
N a. 1.1 feet (0.3 meters) Y b. 1.7 feet (0.5 meters) N c. 1.9 feet (0.6 meters) N d. 2.2 feet (0.7 meters) 1267: What will be the velocity of the tidal current at Coxsackie, NY, at 0945 EST (ZD +5) on 11 March 1983?
N a. 0.3 knot Y b. 0.7 knot N c. 1.2 knots N d. 1.9 knots 1330: You are located within a stationary high pressure area. Your aneroid barometer is falling very slowly. This indicates a(n) __________.
N a. wind shift of 180° N b. large increase in wind velocity Y c. decrease in the pressure of the system N d. increase in the intensity of the system 1422: Cumulus clouds are indicated by what number in illustration D039NG? (D039NG )
N a. 3 N b. 5 N c. 6 Y d. 7 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 1519: You are preparing a weather report form, WS Form B-80. Your position is LAT 10°38'S, LONG 00°14'E. How would this be encoded? (D041NG )
N a. LAT 10.6°S, LONG 00.2°E N b. L106S, 30002 N c. 10385, 0014E Y d. 99106, 30002 1625: A sling psychrometer is used to measure __________.
N a. seawater temperature N b. engine temperature Y c. dry bulb and wet bulb temperatures N d. barometric pressure 1626: Which instrument is used to measure the relative humidity of the air?
N a. A hydrometer Y b. A hygrometer N c. A spectrometer N d. A barograph 1636: A type of precipitation that occurs only in thunderstorms with strong convection currents that convey raindrops above and below the freezing level is known as __________.
N a. sleet Y b. hail N c. freezing rain N d. rime 1646: Which picture in illustration D034NG shows a flashing light? (D034NG )
N a. A N b. B Y c. C N d. D 1687: Which statement is TRUE when comparing cold and warm fronts?
Y a. Cold fronts are more violent and of shorter duration. N b. Cold fronts are milder and last longer. N c. They are very similar with the exception of wind direction. N d. Warm fronts are more violent and of longer duration. 1688: Which type of front forms when a cold front overtakes and forces a warm front upwards?
N a. A cold front Y b. An occluded front N c. A warm front N d. A stationary front 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 1887: The Light List indicates that a light has a nominal range of 10 miles and is 11 feet high. If the visibility is 15 miles and your height of eye is 20 feet, at what approximate distance will you sight the light?
N a. 12.0 miles N b. 11.0 miles N c. 10.0 miles Y d. 9.0 miles 2004: The velocity of the wind, its steady direction, and the amount of time it has blown determines a wind driven current's __________.
N a. temperature N b. density N c. deflection Y d. speed 2119: Which stock number indicates an NGA (NIMA) chart designed for fixing positions at sea and DR plotting while on a long voyage?
Y a. WOAGN520 N b. PILOT16 N c. 16BCO16212 N d. WOPZC5245 2122: A position that is obtained by using two or more intersecting lines of position taken at nearly the same time, is a(n) __________.
Y a. fix N b. running fix N c. estimated position N d. dead-reckoning position 2168: By convention, the north pole of a magnet is painted __________.
Y a. red N b. blue N c. white N d. black 2183: 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 D if the lock walls and piers are not awash?
N a. Three red lights N b. Two red lights Y c. One red light N d. No light 2202: You have completed the magnetic compass adjustments on magnetic east and magnetic south. The vessel is now steady on magnetic west but the compass reads 276°. What action should be taken?
N a. Adjust the compass with the athwartships magnets until the compass reads 264°. Y b. Adjust the compass with the fore-and-aft magnets until the compass reads 273°. N c. Adjust the compass with the quadrantal spheres until the compass reads 270°. N d. Adjust the compass with the athwartships magnets until the compass reads 273°. 2248: A vessel is heading magnetic north and its magnetic compass indicates a heading of 356°. What action should be taken to remove this error during compass adjustment?
N a. If the red ends of the magnets are to port you should raise the athwartships tray. N b. If the red ends of the magnets are to port, and the athwartships tray is at the top, you should add some more magnets. N c. If the red ends of the magnets are to starboard you should lower the athwartships tray. Y d. If the red ends of the magnets are to starboard, and the athwartships tray is at the top, you should add some more magnets. 2255: The height of tide is the __________.
N a. depth of water at a specific time due to tidal effect N b. difference between the depth of the water at high tide and the depth of the water at low tide N c. difference between the depth of the water and the high water tidal level Y d. difference between the depth of the water and the area's tidal datum 2262: The Milky Way is an example of a __________.
N a. cluster Y b. galaxy N c. nova N d. nebula 2486: What is the equivalent of 23 min. 20 sec. in arc units?
N a. 16°40' N b. 12°32' N c. 9°28' Y d. 5°50' 2528: 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 A in the illustration? (D038NG )
N a. One red light N b. Two red lights N c. Two green lights Y d. No light 2639: Under the U.S. Aids to Navigation System used on the Western Rivers, aids to navigation lights on the right descending bank show __________.
Y a. white or green lights N b. white or red lights N c. green lights only N d. white lights only 2780: You are pushing a tow ahead and passing close to another towboat which is pushing ahead in the same direction (you are overtaking). After the towheads pass close alongside __________.
N a. you will gain speed N b. both boats will gain speed N c. the tows will tend to drift apart Y d. the tows will tend to drift together 2830: The proper way to approach a downstream lock where there is an outdraft is to be __________.
N a. wide out from the land wall, keeping the stern in at all times N b. wide out from the land wall, keeping the stern out at all times Y c. close in to the land wall, keeping the stern in at all times N d. close in to the land wall, keeping the stern out at all times 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 3013: A white buoy with an orange rectangle on it displays __________.
Y a. directions N b. dangers N c. exclusion areas N d. All of the above 3018: You take a bearing of 356° of a lighthouse. Which bearing of another object would give the best fix?
N a. 013° N b. 178° Y c. 256° N d. 342° 3055: A single line of position combined with a dead-reckoning position results in a(n) __________.
N a. running fix N b. fix Y c. estimated position N d. assumed position 3114: With respect to automatic identification systems (AIS), which information is expected to be broadcast every 1 to 10 seconds?
N a. Rate of turn N b. Latitude and longitude N c. Navigational status Y d. All of the above