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.
29: You are approaching a multiple-span bridge at night. The main navigational channel span will be indicated by __________.
N a. a quick flashing red or green aid to navigation N b. a steady blue light in the center of the span Y c. 3 white lights in a vertical line in the center of the span N d. a flashing green light in the center of the span 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 77: When there are small differences between the heights of two successive high tides or two low tides, in a tidal day, the tides are called __________.
N a. diurnal Y b. semidiurnal N c. solar N d. mixed 97: The lunar or tidal day is __________.
N a. about 50 minutes shorter than the solar day Y b. about 50 minutes longer than the solar day N c. about 10 minutes longer than the solar day N d. the same length as the solar day 103: In Loran-C the high accuracy of atomic time and frequency controls allows each station to operate __________.
N a. at higher frequencies Y b. on schedule, independently N c. at 1,975 kHz N d. in a multiplex phase 149: 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. What course should you steer at 13 knots to have the maximum CPA?
N a. 339° Y b. 333° N c. 326° N d. 320° 228: The Illustration shows the symbols used on radio facsimile weather charts. Which of these symbols indicates a convergence line? (D042NG )
N a. L N b. F N c. M Y d. Q 248: What is the index error of sextant A in illustration D050NG? (D050NG )
N a. 0° 10' off the arc N b. 0° 10' on the arc N c. 3° 00' off the arc Y d. 4° 20' off the arc 286: On the pole side of the trade wind belt, there is an area of high pressure with weak pressure gradients and light, variable winds. This area is called the __________.
N a. prevailing westerlies N b. geostrophic winds N c. doldrums Y d. horse latitudes 339: The wind at Frying Pan shoals has been north-northeasterly at an average velocity of 30 knots. The predicted set and drift of the rotary current are 355° at 0.8 knot. What current should you expect?
N a. 010° at 1.1 knots N b. 047° at 0.3 knot Y c. 325° at 0.7 knot N d. 279° at 1.0 knot 372: You would find the variation on a polyconic projection chart __________.
Y a. on the compass rose N b. on the mileage scale N c. written on the chart title N d. at each line of longitude 388: You are underway on course 120°T and your maximum speed is 12 knots. The eye of a hurricane bears 150°T, 120 miles from your position. The hurricane is moving towards 295°T at 20 knots. If you maneuver at 12 knots to avoid the hurricane, what could be the maximum CPA?
N a. 89 miles N b. 96 miles N c. 105 miles Y d. 117 miles 390: During the winter months, the southeast trade winds are __________.
Y a. stronger than during the summer months N b. weaker than during the summer months N c. drier than during the summer months N d. wetter than during the summer months 401: You are steaming in a westerly direction along the Gulf Coast. You see ahead of you a lighted buoy showing a red isophase light. Which action should you take?
Y a. Alter course to port and leave the buoy to starboard. N b. Alter course to starboard and leave the buoy to port. N c. Alter course and leave the buoy near by on either side. N d. Alter course and pass the buoy well-off on either side. 402: All of the following can be found on a Pilot Chart EXCEPT information concerning the __________.
N a. percentage of frequency of wave heights N b. percentage of poor visibility conditions N c. sea surface temperatures Y d. amounts of precipitation 421: Daylight savings time is a form of zone time that adopts the time __________.
N a. one zone to the west Y b. one zone to the east N c. two zones to the west N d. two zones to the east 445: The values of the Greenwich hour angle and declination, tabulated in all almanacs, are for the __________.
N a. upper limb of a celestial body N b. lower limb of a celestial body Y c. centers of the various celestial bodies N d. lower limb of the Sun and Moon; center of the stars and planets 557: Your vessel has a draft of 23 feet. On 23 June 1983 you wish to pass over a temporary obstruction near Beaufort, SC, that has a charted depth of 22 feet. Allowing for a safety margin of 3 feet, what is the earliest time after 1600 DST (ZD +4) that this passage can be made?
Y a. 1750 N b. 1815 N c. 1855 N d. 1944 561: Buoys which mark dredging areas are painted __________.
N a. black Y b. yellow N c. green N d. red 580: On 21 January 1981, you observe a back sight of the Sun's lower limb. The sextant altitude (hs) is 121°31.5'. The index error is 2.5' on the arc. The height of eye is 31 feet (9.3 meters). What is the observed altitude (Ho)?
N a. 31°06.2' Y b. 58°53.1' N c. 58°12.2' N d. 58°03.2' 655: The equator is __________.
Y a. the primary great circle of the Earth perpendicular to the axis N b. the line to which all celestial observations are reduced N c. the line from which a celestial body's altitude is measured N d. All of the above 715: The length of the year with respect to the vernal equinox is the __________.
Y a. tropical year N b. sidereal year N c. anomalistic year N d. All of the above 715: The length of the year with respect to the vernal equinox is the __________.
Y a. tropical year N b. sidereal year N c. anomalistic year N d. All of the above 849: The Light List shows that a navigational light has a nominal range of 12 miles and a height above water of 25 feet (7.6 meters). Your height of eye is 30 feet (9.1 meters) and the visibility is 0.5 mile. At what approximate range will you first sight the light?
N a. 0.5 mile Y b. 1.4 miles N c. 5.2 miles N d. 12.0 miles 1003: The quadrantal spheres are used to __________.
Y a. remove deviation on the intercardinal headings N b. remove deviation on the cardinal compass headings N c. remove heeling error N d. compensate for induced magnetism in vertical soft iron 1049: At 0000 you fix your position and change course to 270°T. At 0030 you again fix your position, and it is 0.5 mile east of your DR. Which statement is TRUE?
N a. The set is 090°, drift 0.5 knot. Y b. The set is 090°, drift 1.0 knot. N c. The set is 270°, drift 0.5 knot. N d. The set is 270°, drift 1.0 knot. 1194: In the Northern Hemisphere, an observer at point II in the weather system should experience a wind shift from the __________. (D014NG )
Y a. southwest, clockwise to northwest N b. northeast, clockwise to west-southwest N c. northeast, counterclockwise to northwest N d. east, counterclockwise to south-southwest 1255: The wind velocity is higher in the dangerous semicircle of a tropical cyclone because of the __________.
N a. extension of the low pressure ridge N b. direction of circulation and pressure gradient N c. recurvature effect Y d. the wind circulation and forward motion of the storm 1331: When trying to sight a lighthouse you notice a glare from a town in the background. The range at which the light may be sighted due to this glare is __________.
Y a. considerably reduced N b. increased slightly due to extra lighting N c. unchanged N d. increased if the light is red or green due to contrast with the glare 1355: The parallax of the Moon is greatest when the Moon is __________.
N a. in the zenith at perigee N b. on the horizon at apogee N c. at its maximum altitude at apogee Y d. on the horizon at perigee 1355: The parallax of the Moon is greatest when the Moon is __________.
N a. in the zenith at perigee N b. on the horizon at apogee N c. at its maximum altitude at apogee Y d. on the horizon at perigee 1365: The same side of the Moon is always toward the Earth, but more than half of its surface has been seen due to libration. Libration in latitude occurs because __________.
Y a. the axis of rotation is tilted about 6.5° to the axis of revolution N b. the speed of revolution varies, while the rotational speed is essentially constant N c. of the rotational oscillation of the Moon with respect to its radius vector N d. of augmentation 1386: The FIRST indications a mariner will have of the approach of a warm front will be __________.
N a. large cumulonimbus clouds building up N b. low dark clouds with intermittent rain N c. fog caused by the warm air passing over the cooler water Y d. high clouds gradually followed by lower thicker clouds 1387: You will be entering the Mystic River in Connecticut. What is the current at the Highway Bridge at 1900 EST (ZD +5) on 24 January 1983?
N a. 2.2 knots flooding N b. Slack water Y c. Slight ebb N d. 2.5 knots ebbing 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 1504: The time meridian used when computing the height of tide for Pensacola Bay, FL, is __________.
N a. 75°00'W N b. 82°30'W Y c. 90°00'W N d. 97°30'W 1528: Cirrostratus clouds are indicated by which number? (D039NG )
N a. 1 Y b. 2 N c. 8 N d. 9 1647: Cumulonimbus clouds are formed by __________.
Y a. vertical air movements N b. heavy rainstorms N c. horizontal air movements N d. any movement of moist air 1678: Which information is NOT provided in broadcasts by the National Institute of Standards and Technology?
N a. Storm Warnings N b. Time Announcements N c. GPS Information Y d. NAVAREA Warnings 1797: A phenomenon where the atmospheric pressure is higher than that of other surrounding regions is called __________.
Y a. a high pressure area N b. a low front or an occluded front N c. the "trade winds" N d. the "doldrums" 1906: In the horizon system of coordinates what is equivalent to latitude on the Earth?
Y a. Altitude N b. Zenith N c. Declination N d. Zenith distance 1919: The nadir is the point on the celestial sphere that is __________.
N a. 90° away from the zenith N b. over Greenwich N c. on the western horizon Y d. directly below the observer 1950: The error in a sextant altitude caused by refraction is greatest when the celestial body is __________.
N a. high in the sky Y b. near the horizon N c. rising N d. at or near transit 2070: What is the relative bearing of an object on the port beam?
N a. 045° N b. 090° N c. 180° Y d. 270° 2082: You are holding position above Gallipolis Lock and Dam when you hear two long blasts of the horn from the lock. This indicates that you should __________.
Y a. enter the riverward lock N b. hold position until two more upbound tows have locked through N c. enter the landward lock N d. hold position until the lower gates are closed 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 2129: 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?
N a. No lights Y b. Three red lights N c. Two red lights N d. One red light 2167: 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?
N a. One red light N b. Two red lights Y c. Three red lights N d. One amber light 2282: 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°. You should now adjust the compass until it reads __________.
N a. 264° N b. 270° Y c. 273° N d. Do not adjust the compass, just record the error. 2376: A large group of stars revolving around a center is known as a __________.
N a. cluster N b. shower N c. constellation Y d. galaxy 2439: Which statement about the time diagram in illustration D008NG is TRUE? (D008NG )
Y a. You are in east longitude. N b. The Sun is setting for you. N c. Your date is different from the Greenwich date. N d. The GHA is approximately 160°. 2683: A vessel's position should be plotted using bearings of __________.
N a. buoys close at hand Y b. fixed known objects on shore N c. fixed objects N d. All of the above 2741: A general chart could have a scale of __________.
Y a. 1:200,000 N b. 1:1,000,000 N c. 1:50,000 N d. not more than 1:25,000 2840: The lockmaster has given you permission to tie off on the lower guide wall to wait your turn to lock through. What should you be most concerned with?
N a. A downbound vessel N b. An upbound vessel Y c. Current reaction when the lock chamber is being emptied N d. Current reaction when the lock chamber is being filled 2892: The Light List indicates that a dayboard is a type NB. You should __________.
N a. see a black triangle N b. look for another daymark forming a range Y c. expect a daymark of no lateral significance N d. check to enter the correct channel at the junction daymark 2936: Information on search and rescue procedures and special, local communications used in Mexican waters will be found in the __________.
N a. World Port Index N b. International Code of Signals (Pub 102) Y c. Sailing Directions (Planning Guides) N d. International Aeronautical and Maritime Search and Rescue Manual 3005: The agonic line on an isomagnetic chart indicates the __________.
N a. magnetic equator N b. magnetic longitude reference line Y c. points where there is no variation N d. points where there is no annual change in variation 3078: Which data must ECDIS be able to record at one-minute intervals?
N a. Position N b. Electronic navigational chart source N c. Course made good history Y d. All of the above 3084: An ECDIS is required to display which information?
Y a. Soundings N b. Waypoints N c. Meteorological data N d. Radar targets 3108: Automatic identification systems (AIS) are expected to broadcast all of the following information EXCEPT __________.
N a. navigation status N b. ship's heading Y c. port of origin N d. time stamp