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.
67: What is the definition of height of tide?
Y a. The vertical distance from the tidal datum to the level of the water at any time N b. The vertical difference between the heights of low and high water N c. The vertical difference between a datum plane and the ocean bottom N d. The vertical distance from the surface of the water to the ocean floor 87: A tide is called diurnal when __________.
Y a. only one high and one low water occur during a lunar day N b. the high tide is higher and the low tide is lower than usual N c. the high tide and low tide are exactly six hours apart N d. two high tides occur during a lunar day 135: The standard meridian for the time zone +1 is __________.
N a. 0° N b. 7 1/2°W Y c. 15°W N d. 7 1/2°E 240: In a river subject to tidal currents, the best time to dock a ship without the assistance of tugs is __________.
N a. at high water N b. when there is a following current Y c. at slack water N d. at flood 323: The position accuracy of Loran-C degrades with increasing distance from the transmitting stations as __________.
N a. gains are made over the signal path Y b. a result of variation in propagation conditions N c. the frequency of the pulses increases N d. the stations shift pulses 363: Your dead reckoning position should be plotted __________.
N a. whenever an estimated position is plotted N b. when it agrees with your loran position N c. when coming on or going off soundings Y d. at least every hour on the hour in the open waters of the sea 370: Prevailing winds between 30°N and 60°N latitude are from the __________.
N a. north N b. south N c. east Y d. west 382: Which would you consult for information about the general current circulation in the North Atlantic Ocean?
Y a. Pilot chart N b. Coast Pilot N c. Current Table N d. Climatological Atlas 397: The mean tide level at Peaks Island, ME, is __________.
N a. 1.8 feet (0.5 meters) N b. 2.5 feet (0.8 meters) N c. 3.2 feet (1.0 meters) Y d. 4.5 feet (1.4 meters) 461: Under the U.S. Aids to Navigation System, a yellow buoy may __________.
Y a. mark a fish net area N b. be lighted with a white light N c. show a fixed red light N d. All of the above 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° 509: A line of position derived by radar range from an identified point on a coast will be a(n) __________.
N a. straight line Y b. arc N c. parabola N d. line parallel to the coast 667: The navigable semicircle of a typhoon in the Southern Hemisphere is the area __________.
N a. behind the typhoon, measured from 90° to 180°From each side of the storm's track Y b. to the right of the storm's track N c. ahead of the typhoon, measured from the storm's track to 90° on each side N d. measured from due south, counterclockwise 180° 687: The drift and set of tidal, river, and ocean currents refer to the __________.
N a. position and area of the current Y b. speed and direction toward which the current flows N c. type and characteristic of the current's flow N d. None of the above 703: Which statement concerning the operation of radar in fog is TRUE?
N a. Radar ranges are less accurate in fog. N b. Navigation buoys will always show up on radar. N c. A sandy beach will show up clearer on radar than a rocky cliff. Y d. Small wooden boats may not show up on radar. 710: What is the FIRST sign of the existence of a well developed tropical cyclone?
N a. Gale force winds from the north Y b. An unusually long ocean swell N c. Steep, short-period waves and light wind N d. Thunderstorms and higher than usual humidity 713: The closest point of approach (CPA) of a contact on a relative motion radar may be determined __________.
N a. immediately when the contact is noted on radar N b. only if the radar scope is watched constantly Y c. after the contact has been marked at least twice N d. by an occasional glance at the radar 766: Which position includes the effects of wind and current?
N a. Dead reckoning position N b. Leeway position N c. Set position Y d. Estimated position 862: The U.S. Coast Guard publishes __________.
Y a. Light Lists N b. U.S. Coast Pilots N c. Radio Navigational Aids N d. All of the above 880: You are taking bearings on two known objects ashore. The BEST fix is obtained when the angle between the lines of position is __________.
N a. 60° Y b. 90° N c. 45° N d. 30° 911: Under the IALA-B Buoyage System, a buoy displaying a red light will __________.
Y a. be left to starboard when entering from seaward N b. show a light characteristic of Morse Code "A" N c. be lettered N d. have a radar reflector 920: What is the average speed of the movement of a hurricane following the recurvature of its track?
N a. 5 to 10 knots Y b. 20 to 30 knots N c. 40 to 50 knots N d. Over 60 knots 946: The wind circulation around a high pressure center in the Northern Hemisphere is __________.
N a. counterclockwise and moving towards the high N b. counterclockwise and moving outward from the high N c. clockwise and moving towards the high Y d. clockwise and moving outward from the high 963: To center a compass bowl in its binnacle, you should have the ship on an even keel, heading north or south, and adjust the screws until __________.
N a. the compass heading is in line with the lubber's line N b. there is no lost motion in the gimbal rings Y c. no change of heading by compass is observed if you raise and lower the heeling magnet N d. the gimbal rings do not strike the compass frame when they are tilted 987: Which current is responsible for the movement of icebergs into the North Atlantic shipping lanes?
N a. Iceland Current N b. Baltic Current Y c. Labrador Current N d. Baffin Current 1084: As the temperature of an air mass decreases, the __________.
N a. absolute humidity decreases Y b. relative humidity increases N c. specific humidity decreases N d. dew point rises 1113: A single vertical magnet placed underneath the compass in the binnacle is used to compensate for __________.
N a. the horizontal component of the permanent magnetism Y b. deviation caused by the vessel's inclination from the vertical N c. induced magnetism in the horizontal soft iron N d. induced magnetism in the vertical soft iron 1132: On charts of U.S. waters, a magenta marking is NOT used for marking a __________.
N a. radio beacon Y b. 5-fathom curve N c. prohibited area N d. lighted buoy 1139: A star is observed at lower transit. The line of position derived from this sight is __________.
N a. on the prime vertical Y b. a latitude line N c. a longitude line N d. of no special significance 1184: Your position X is at LAT 35°S. Which winds are you experiencing? (D009NG )
Y a. Northeasterly N b. Northwesterly N c. Southeasterly N d. Southwesterly 1242: Daymarks marking the starboard side of the channel when going towards the sea are __________.
Y a. green squares N b. green triangles N c. red squares N d. red triangles 1247: What is the predicted velocity of the tidal current 2 miles west of Southwest Ledge for 2330 DST (ZD +4) on 7 September 1983?
Y a. 1.3 knots N b. 1.6 knots N c. 1.9 knots N d. 2.2 knots 1292: A triangular daymark would be colored __________.
Y a. red N b. red and white N c. green N d. green and white 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 1464: A line of position derived from a loran reading is a section of a(n) __________.
N a. straight line N b. arc N c. parabola Y d. hyperbola 1491: You are on course 138°T. To check the latitude of your vessel you should observe a celestial body on which bearing?
N a. 138° N b. 270° N c. 318° Y d. 000° 1517: When determining compass error by an azimuth of Polaris, you enter the Nautical Almanac with the __________.
N a. GHA Aries Y b. LHA Aries N c. LHA Polaris N d. GHA Polaris 1578: The LMT of sunrise on the standard meridian is 0552. Your longitude is 99°15'E. What is your ZT of sunrise?
N a. 0512 N b. 0529 N c. 0552 Y d. 0615 1671: Cirrus clouds are composed primarily of __________.
Y a. ice crystals N b. water droplets N c. snow crystals N d. nitrogen 1786: You are downbound approaching a lock and see 3 green lights in a vertical line. This indicates __________.
N a. that the lock chamber is open and ready to receive your tow N b. that you should hold up until the signal changes to 2 green lights Y c. the upstream end of the river wall N d. the upstream end of the land wall 1829: 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 E in the illustration? (D036NG )
N a. One red light N b. Two green lights N c. Three green lights Y d. No light 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. 2053: When outbound from a U.S. port, a buoy displaying a flashing red light indicates __________.
N a. a sharp turn in the channel to the right Y b. the port side of the channel N c. a junction with the preferred channel to the left N d. a wreck to be left on the vessel's starboard side 2068: 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 )
Y a. One red light N b. Two red lights N c. Three red lights N d. One amber light 2199: Denebola is found in what constellation?
N a. Hydrus Y b. Leo N c. Centaurus N d. Aquila 2262: The Milky Way is an example of a __________.
N a. cluster Y b. galaxy N c. nova N d. nebula 2349: The summer solstice is the point where the Sun is at __________.
Y a. maximum declination north N b. maximum declination south N c. 0° declination going to northerly declinations N d. 0° declination going to southerly declinations 2351: A position obtained by applying ONLY your vessel's course and speed to a known position is a __________.
N a. running fix N b. probable position N c. fix Y d. dead-reckoning position 2353: A single line of position combined with a dead-reckoning position results in a(n) __________.
Y a. estimated position N b. assumed position N c. fix N d. running fix 2526: What is the equivalent of 10 min. 52 sec. in arc units?
N a. 0°47' N b. 1°12' Y c. 2°43' N d. 3°52' 2562: In the time diagram shown __________. (D005NG )
N a. the GHA of the Sun is approximately 330° Y b. your date is one day later than the date at Greenwich N c. the LHA of the Sun is approximately 120° N d. you are in west longitude 2738: While navigating in fog off a coastline of steep cliffs, you hear the echo of the ship's fog horn 3 seconds after the signal was sounded. What is the distance to the shore?
N a. 1100 yards N b. 872 yards Y c. 550 yards N d. 792 yards 2764: You are in a channel inbound from sea. A daymark used to mark a channel junction when the preferred channel is to port will have the shape indicated by what letter in illustration D045NG?
N a. A N b. B N c. C Y d. D 2801: Mean high water is used __________.
N a. as the reference for soundings on the Gulf coast of the U.S. Y b. to indicate the shoreline where there is a large tidal fluctuation N c. as the reference plane for bottom contour lines N d. as the sounding datum for rivers, lakes, etc. regulated by locks 2810: When steering a tow downstream around the shape of a sand bar, and staying on the proper side of the buoys, an operator should be cautious of __________.
Y a. eddies under the bar N b. swift current under the bar causing loss of control N c. cross-currents pushing the tow away from the bar N d. cross-currents pushing the tow into the bar 2945: A position that is obtained by applying estimated current and wind to your vessel's course and speed is a(n) __________.
Y a. estimated position N b. dead reckoning position N c. fix N d. None of the above 2968: Some locations maintain a zone time of -13. What are the zone time and date if the Greenwich time and date are 0152, 10 January?
N a. 0052, 9 January N b. 0258, 9 January Y c. 1452, 10 January N d. 0052, 11 January 3016: The radar control that shortens all echoes on the display and reduces clutter caused by rain or snow is the __________.
N a. sensitivity time control (sea clutter control) N b. receiver gain control N c. brilliance control Y d. fast time constant (differentiator) 3041: The letter H in illustration D006NG represents the __________.
N a. refractive horizon N b. geoidal horizon N c. celestial horizon Y d. visible horizon 3077: ECDIS must have the capability to preserve the record of the voyage track for the previous __________.
N a. 4 hours N b. 6 hours Y c. 12 hours N d. 24 hours