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.
20: You are underway on course 050°T and your maximum speed is 12 knots. The eye of a hurricane bears 120°T, 110 miles from your position. The hurricane is moving towards 285°T at 25 knots. If you maneuver at 12 knots to avoid the hurricane, what could be the maximum CPA?
Y a. 77 miles N b. 82 miles N c. 87 miles N d. 93 miles 41: Mean high water is the reference plane used for __________.
N a. all vertical measurements Y b. heights above water of land features such as lights N c. soundings on the East and West Coasts N d. water depths on the East Coast only 147: Which statement is TRUE concerning equatorial tides?
N a. They occur when the Sun is at minimum declination north or south. N b. They occur when the Moon is at maximum declination north or south. Y c. The difference in height between consecutive high or low tides is at a minimum. N d. They are used as the basis for the vulgar establishment of the port. 215: The equation of time is 12m 00s and the mean Sun is ahead of the apparent Sun. If you are on the central meridian of your time zone, at what zone time will the apparent Sun cross the meridian?
N a. 1148 N b. 1200 Y c. 1212 N d. It cannot be determined from the information given. 314: Which of these sextant errors is nonadjustable?
N a. Prismatic error N b. Graduation error N c. Centering error Y d. All of the above 329: The symbols shown are used on radio facsimile weather charts. Which symbol indicates a weather boundary? (D042NG )
N a. I N b. H N c. G Y d. F 357: On 10 August 1983 you will dock near Days Point, Weehawken, on the Hudson River, at 1800 DST (ZD +4). The charted depth alongside the pier is 24 feet (7.3 meters). What will be the depth of water when you dock?
N a. 23.5 feet (7.1 m) Y b. 23.9 feet (7.2 m) N c. 24.9 feet (7.5 m) N d. 26.3 feet (8.0 m) 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 460: When using horizontal sextant angles of three objects to fix your position, an indeterminate position will result in which situation?
N a. The objects lie in a straight line. N b. The vessel is inside of a triangle formed by the objects. N c. The vessel is outside of a triangle formed by the objects. Y d. A circle will pass through your position and the three objects. 466: In the relatively calm area near the hurricane center, the seas are __________.
N a. moderate but easily navigated N b. calm Y c. mountainous and confused N d. mountainous but fairly regular as far as direction is concerned 484: The needle of an aneroid barometer points to 30.05 on the dial. This indicates that the barometric pressure is __________.
Y a. 30.05 inches of mercury N b. 30.05 millimeters of mercury N c. 30.05 millibars N d. falling 530: Under the U.S. Aids to Navigation System, a lighted buoy with a spherical topmark marks __________.
N a. the port side of the channel N b. the position of underwater cables Y c. safe water N d. a hazard to navigation 588: You are underway on course 050°T and your maximum speed is 10 knots. The eye of a hurricane bears 100°T, 90 miles from your position. The hurricane is moving towards 285°T at 19 knots. If you maneuver at 10 knots to avoid the hurricane, what could be the maximum CPA?
N a. 39 miles N b. 45 miles Y c. 53 miles N d. 59 miles 588: You are underway on course 050°T and your maximum speed is 10 knots. The eye of a hurricane bears 100°T, 90 miles from your position. The hurricane is moving towards 285°T at 19 knots. If you maneuver at 10 knots to avoid the hurricane, what could be the maximum CPA?
N a. 39 miles N b. 45 miles Y c. 53 miles N d. 59 miles 590: On 16 January 1981, you take a sight of a star. The sextant altitude (hs) is 4°33.0'. The temperature is -10°C, and the barometer reads 992 millibars. The height of eye is 42 feet. The index error is 1.9' off the arc. What is the observed altitude (Ho)?
N a. 4°10.2' N b. 4°14.3' Y c. 4°17.0' N d. 4°24.1' 608: In which voyage, between two points, is the rhumb line distance NOT approximately the same as the great circle distance?
N a. The two points are in low latitudes in the same hemisphere. Y b. The two points are in high latitudes in the same hemisphere. N c. The two points are near the equator, but in different hemispheres. N d. One point is near the equator, one point is in a high latitude, and both are near the 180th meridian. 716: Standard atmospheric pressure in inches of mercury is __________.
N a. 30.00 N b. 28.92 Y c. 29.92 N d. 29.00 723: If there is any doubt as to the proper operation of a radar, which statement is TRUE?
N a. Only a radar expert can determine if the radar is operating. N b. All radars have indicator lights and alarms to signal improper operation. Y c. A radar range compared to the actual range of a known object can be used to check the operation of the radar. N d. The radar resolution detector must be energized to check the radar. 820: A position obtained by crossing lines of position taken at different times and advanced to a common time is a(n) __________.
N a. dead-reckoning position Y b. running fix N c. estimated position N d. fix 889: The Light List shows that a navigational light has a nominal range of 6 miles and a height above water of 18 feet (5.5 meters). Your height of eye is 47 feet (14.3 meters) and the visibility is 1.5 miles. At what approximate range will you first sight the light?
N a. 1.5 miles Y b. 2.0 miles N c. 6.0 miles N d. 12.7 miles 930: Which statement about radio navigational warnings is TRUE?
Y a. The topics for warnings included in HYDROLANTS, HYDROPACS, and NAVAREA warnings are the same. N b. NAVAREA warnings concern only coastal navigation and inland navigation in large bays or sounds such as Puget Sound. N c. The United States is responsible for NAVAREA warnings in the North Atlantic north of 7°N, and west of 15°W. N d. Long range radio navigational warnings are usually broadcast by radiotelephone, radiotelegraph, and radio-teletypewriter. 975: The change in the length of the day becomes greater as latitude increases because of the __________.
N a. path of the ecliptic relative to the equator N b. decreasing distance between meridians N c. changing distance between the Earth and the Sun Y d. increased obliquity of the Sun's diurnal circle 1163: The total magnetic effects which cause deviation of a vessel's compass can be broken down into a series of components which are referred to as __________.
N a. divisional parts Y b. coefficients N c. fractional parts N d. equations 1174: Your vessel is enroute from Japan to Seattle and is located at position I on the weather map. You should experience which weather condition? (D013NG )
N a. Clear skies with warm temperatures N b. Steady precipitation N c. Overcast skies with rising temperature Y d. Thundershowers 1266: A line of clouds, sharp changes in wind direction, and squalls are most frequently associated with a(n) __________.
N a. occluded front N b. warm front Y c. cold front N d. warm sector 1309: When recording the wind direction in the weather log, you would report the __________.
N a. direction the wind is blowing toward Y b. direction the wind is blowing from N c. duration of the maximum gust of wind N d. wind chill factor 1363: True heading differs from magnetic heading by __________.
N a. deviation Y b. variation N c. compass error N d. northerly error 1396: On the approach of a warm front the barometric pressure usually __________.
Y a. falls N b. rises N c. is steady N d. is unreliable 1400: Which type of cloud is among the most dependable for giving an indication of an approaching weather system?
N a. Cumulus Y b. Altostratus N c. Cumulostratus N d. Nimbus 1403: Which statement about the gyrocompass is FALSE?
Y a. Its accuracy remains the same at all latitudes. N b. It seeks the true meridian. N c. It can be used near the Earth's magnetic poles. N d. If an error exists, it is the same on all headings. 1431: A lighthouse is 120 feet (36.6 meters) high and the light has a nominal range of 18 miles. Your height of eye is 42 feet (12.8). If the visibility is 11 miles, approximately how far off the light will you be when the light becomes visible?
N a. 12.5 miles N b. 16.0 miles Y c. 19.0 miles N d. 23.5 miles 1463: If the gyrocompass error is east, what describes the error and the correction to be made to gyrocompass headings to obtain true headings?
Y a. The readings are too low (small numerically) and the amount of the error must be added to the compass to obtain true N b. The readings are too low and the amount of the error must be subtracted from the compass to obtain true N c. The readings are too high (large numerically) and the amount of the error must be added to the compass to obtain true N d. The readings are too high and the amount of the error must be subtracted from the compass to obtain true 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 1560: Under the IALA-A and B Buoyage Systems, a buoy with alternating red and white vertical stripes indicates __________.
Y a. that there is navigable water all around N b. an isolated danger exists N c. that the preferred channel is to port N d. that the preferred channel is to starboard 1631: Which picture shows an occulting light? (D034NG )
N a. A Y b. B N c. C N d. D 1634: A lighted buoy to be left to starboard, when entering a U.S. port from seaward, shall have a __________.
Y a. red light N b. white light N c. green light N d. light characteristic of Morse (A) 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 1699: In the Northern Hemisphere, when the center of a high pressure system is due east of your position, you can expect winds from the __________.
N a. south to west Y b. south to east N c. north to west N d. north to east 1742: In the Northern hemisphere which semicircle of a hurricane is the navigable semicircle?
Y a. Left N b. Right N c. Front N d. Back 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. 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. 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 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 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 2048: You are upbound approaching a lock and dam and see two green lights in a vertical line. This indicates __________.
Y a. the downstream end of an intermediate wall N b. that a double lockage is in progress N c. the downstream end of the land wall N d. the navigable pass of a fixed weir dam 2131: The white lights in a vertical line on a multiple-span bridge indicate __________.
Y a. the main channel N b. the draw span is inoperable N c. the river is obstructed under that span N d. scaffolding under the span is reducing the vertical clearance 2145: What lights would you see on the Illinois water way when any wickets of the dam or bear traps are open, or partially open, which may cause a set in the current conditions in the upper lock approach?
N a. Green over red N b. Red over blue N c. Green over amber (yellow) Y d. Red over amber (yellow) 2416: An orange and white buoy indicating a vessel-exclusion area will be marked with what symbol?
N a. Open-faced diamond Y b. Diamond with a cross N c. Circle N d. Square 2642: Local sidereal time is equal to the __________.
N a. GHA of Aries minus 180° N b. SHA of Aries Y c. LHA of Aries N d. right ascension of Aries plus 180° 2744: The standard atmospheric pressure measured in inches of mercury is __________.
Y a. 29.92 N b. 500.0 N c. 760.0 N d. 1013.2 2752: A daymark used to indicate the safe water in a channel will have which of the shapes shown? (D045NG )
N a. A N b. B Y c. C N d. D 2788: The Light List indicates that a dayboard is a type KGW. You should __________.
N a. see a green and white diamond N b. leave it to port when southbound on the Atlantic Coast ICW N c. pass it close aboard on either side Y d. look for another daymark to form the range 2809: The diurnal variation of pressure is not visible in the middle latitudes in winter because __________.
Y a. it is masked by the pressure changes of moving weather systems N b. the decreased gravitational effect from the sun causes the variation to fade N c. the decreased average temperature is less than the critical temperature N d. the increased Coriolis force disperses the pressure variation 2839: Privately maintained aids to navigation included in the Light List __________.
N a. are painted white and must use a white light if lighted N b. must be conspicuously marked by a signboard with the words "PRIVATE AID" Y c. must conform to the standards of the U.S. Aids to Navigation System N d. are not permitted in or along first-class waterways and may be authorized for second- and third-class waterways 2842: The draw span of a floating drawbridge may be marked with __________.
N a. two white lights Y b. a yellow diamond N c. flashing blue lights N d. three red lights on each side of the draw 2923: You should plot your dead reckoning position __________.
N a. from every estimated position Y b. from every fix or running fix N c. every three minutes in pilotage waters N d. only in pilotage waters 2964: The pictures shown represent the geographic location of a vessel and the radar presentation at the same time. Which statement is TRUE? (D011NG )
N a. Ship No. 1 does not paint as an individual target due to the side lobe affect. N b. The small island is not detected due to the limitation caused by the pulse length. N c. A tangent bearing of the headland to the south-southeast is corrected by subtracting one-half of the beam width. Y d. Ship No. 2 is not detected due to the combined affects of beam width and pulse length. 3103: In general, on how many radio channels will an automatic identification system (AIS) operate?
N a. 1 Y b. 3 N c. 4 N d. 12 3107: Automatic identification systems (AIS) are expected to broadcast all of the following information EXCEPT __________.
Y a. Port of origin N b. Name of vessel N c. Course and speed over ground N d. Draft of vessel 3120: The short text messaging feature of the automatic identification system (AIS) allows for messages of up to___.
N a. 56 characters N b. 64 characters N c. 128 characters Y d. 158 characters