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.
6: Wind velocity varies __________.
N a. directly with the temperature of the air mass Y b. directly with the pressure gradient N c. inversely with the barometric pressure N d. inversely with the absolute humidity 15: What is the length of a nautical mile?
N a. 1,800 meters N b. 2,000 yards Y c. 6,076 feet N d. 5,280 feet 47: The range of tide is the __________.
N a. distance the tide moves out from the shore N b. duration of time between high and low tide Y c. difference between the heights of high and low tide N d. maximum depth of the water at high tide 64: Mean lower low water is the reference plane used for __________.
N a. all vertical measurements N b. heights above water for lights, mountains, etc. Y c. soundings on the U.S. east and west coasts N d. water depths on the U.S. east coast only 111: Green lights may appear on __________.
Y a. horizontally banded buoys N b. vertically striped buoys N c. yellow buoys N d. spherical buoys 137: Priming of the tides occurs __________.
N a. at times of new and full Moon N b. when the Earth, Moon, and Sun are lying approximately on the same line N c. when the Moon is between first quarter and full and between third quarter and new Y d. when the Moon is between new and first quarter and between full and third quarter 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° 180: What is a lighted safe water mark fitted with to aid in its identification?
Y a. A spherical topmark N b. Red and white retroreflective material N c. A sequential number N d. A red and white octagon 202: On charts of U.S. waters, a magenta marking is NOT used for marking a __________.
N a. radio beacon N b. lighted buoy N c. prohibited area Y d. 5-fathom curve 206: The winds you would expect to encounter in the North Atlantic between latitudes 5° and 30° are known as the __________.
N a. doldrums N b. westerlies Y c. trades N d. easterlies 224: A sextant having an index error that is "off the arc" has a __________.
Y a. positive correction N b. dip error N c. negative correction N d. semidiameter error 224: A sextant having an index error that is "off the arc" has a __________.
Y a. positive correction N b. dip error N c. negative correction N d. semidiameter error 258: 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 __________.
N a. cirrus clouds N b. long swells N c. smoother seas and warmer water Y d. steeper waves, closer together 362: Which statement about a simple conic chart projection is TRUE?
N a. It is an equal-area projection. N b. It is a conformal projection. N c. Meridians appear as curved lines. Y d. The scale is correct along any meridian. 399: Where will you find information about the duration of slack water?
N a. American Practical Navigator N b. Sailing Directions N c. Tide Tables Y d. Tidal Current Tables 456: Which condition exists in the eye of a hurricane?
N a. Wind rapidly changing direction N b. A temperature much lower than that outside the eye N c. Towering cumulonimbus clouds Y d. An extremely low barometric pressure 488: A great circle crosses the equator at 93°W. It will also cross the equator at what other longitude?
N a. 13°E Y b. 87°E N c. 177°E N d. 177°W 617: You are bound for the Chelsea docks in the Hudson River. The Captain wants to arrive at the docks at the first slack water on 28 July 1983. You are keeping daylight saving time. What time should you be at the docks?
Y a. 0215 N b. 0530 N c. 0811 N d. 0911 632: You must construct a Mercator projection for an area bounded by latitudes 40° - 47°N and longitudes 176°E to 176°W on a paper 28 X 36 inches. Allow a neat line of one inch. What will be the separation between meridians?
N a. 3.190 inches Y b. 3.249 inches N c. 3.529 inches N d. 3.714 inches 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° 780: Apparent wind speed blowing across your vessel while underway can be measured by a(n) __________.
N a. barometer N b. wind vane Y c. anemometer N d. thermometer 800: You are to sail from Elizabethport, NJ, on 17 November 1983 with a maximum draft of 27 feet. You will pass over an obstruction in the channel near Sandy Hook that has a charted depth of 26 feet. The steaming time from Elizabethport to the obstruction is 1h 50m. What is the earliest time (ZD +5) you can sail on 17 November and pass over the obstruction with 2 feet of clearance?
Y a. 0056 N b. 0124 N c. 0154 N d. 0218 855: Which condition exists at the summer solstice in the Northern Hemisphere?
N a. The north polar regions are in continual darkness. N b. The Northern Hemisphere is having short days and long nights. Y c. The Southern Hemisphere is having winter. N d. The Sun shines equally on both hemispheres. 901: Under the IALA-A Buoyage System, a buoy indicating that the preferred channel is to port when entering from seaward, can have a __________.
N a. can shape N b. group-flashing (2) light N c. red-and-green vertical stripes Y d. green light 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 978: The wind velocity is higher in the dangerous semicircle of a tropical cyclone because of the __________.
N a. recurvature effect N b. extension of the low pressure ridge Y c. wind circulation and forward motion of the storm N d. direction of circulation and pressure gradient 1085: A chart position enclosed by a semi-circle is a(n) __________.
N a. fix N b. estimated position Y c. dead reckoning position N d. running fix 1171: A light that has a light period shorter than its dark period is described as __________.
Y a. flashing N b. pulsating N c. occulting N d. alternating 1176: After a cold front passes, the barometric pressure __________.
N a. drops, and the temperature drops N b. drops, and the temperature rises Y c. rises, and the temperature drops N d. rises, and the temperature rises 1288: Your vessel will be docking at Chester, PA, during the evening of 22 April 1983. The chart shows a depth of 20 feet (6.1 meters) at the pier. What will be the depth of water available at 2310 EST (ZD +5)?
N a. 19.2 feet (5.9 meters) N b. 20.8 feet (6.3 meters) Y c. 24.7 feet (7.5 meters) N d. 25.8 feet (7.9 meters). 1299: What will be the time (ZD +5) of the second high tide at Weymouth Fore River Bridge, MA, on 12 November 1983?
N a. 1639 N b. 1643 N c. 1647 Y d. 1650 1304: The distance to the nearest vertex from any point on a great circle track cannot exceed __________.
Y a. 5400 nautical miles N b. 5840 nautical miles N c. 6080 nautical miles N d. 10,800 nautical miles 1369: Which of the following is the most useful factor for predicting weather?
N a. The present reading of the barometer N b. The previous reading of the barometer N c. The difference in the barometric readings within the past 24 hours Y d. The rate and direction of change of barometric readings 1377: What is the velocity of the tidal current at the east end of Pollock Rip Channel at 1700 DST (ZD +4) on 23 July 1983?
N a. 0.6 knot ebbing N b. 0.8 knot flooding Y c. 1.5 knots flooding N d. 1.9 knots flooding 1418: Static on your AM radio may be __________.
Y a. an indication of nearby thunderstorm activity N b. an indication of "clearing" weather N c. of no meteorological significance N d. a sign of strong winds 1437: Determine the time after 0300 CST (ZD +6) when the velocity of the tidal current will be 0.5 knot on 16 April 1983, at Port Arthur Canal Entrance, TX.
N a. 0436 Y b. 0507 N c. 0538 N d. 0554 1494: Cirrocumulus clouds are indicated by which number? (D039NG )
N a. 7 N b. 5 Y c. 3 N d. 1 1505: At 0000 you fix your position and change course to 090°T. At 0030 you again fix your position and it is 0.5 mile east of your DR. Which statement is TRUE?
Y a. The current is easterly. N b. The drift is 0.5 knot. N c. You should alter course to the right to regain the track line. N d. The current is perpendicular to your track line. 1593: Apparent altitude is sextant altitude corrected for __________.
N a. parallax and personal error Y b. inaccuracies in the reading and reference level N c. visibility and magnitude N d. All of the above are correct 1648: A sign of thunderstorm development is a cumulus cloud __________.
N a. darkening, growing in size and forming an anvil top N b. that shows extensive vertical development N c. creating cold downdrafts that are felt on the ground Y d. All of the above 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 1743: In the Northern Hemisphere, if your vessel is in a hurricane's navigable semicircle it should be positioned with the wind on the __________.
Y a. starboard quarter, hold course and make as much speed as possible N b. port bow, hold course and make as much speed as possible until the hurricane has passed N c. port quarter, maintain course and make as much speed as possible N d. starboard bow and heave to until the hurricane has passed 1752: What is the major limitation in using the Sight Reduction Tables for Air Navigation Volume I (Pub. No. 249) for star sights?
N a. More accuracy is needed for celestial observations on board ship than what is tabulated. N b. Sights must be made at even time increments to benefit from the tables. Y c. Only certain stars are included and sights must be limited to those stars. N d. Only first magnitude stars are tabulated. 1892: The shoreline shown on nautical charts of areas affected by large tidal fluctuations is usually the line of mean __________.
N a. lower low water N b. low water N c. tide level Y d. high water 1930: The phase correction should be applied to sights of Venus and Mars __________.
N a. during day time observations only Y b. during twilight observations only N c. at all times N d. when observed at altitudes of less than 25° 1979: The principal vertical circle is that great circle on the celestial sphere that passes through the __________.
N a. zenith and the celestial body Y b. zenith and the north and south poles N c. poles and Greenwich N d. zenith and is parallel to the horizon 2020: A vessel heading ENE is on a course of __________.
N a. 022.5° N b. 045.0° Y c. 067.5° N d. 090.0° 2177: This diagram 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 )
N a. One amber light N b. Three red lights N c. Two red lights Y d. One red light 2258: The primary use of apparent time in marine navigation is to __________.
N a. calculate sunrise or sunset N b. determine zone time N c. enter an almanac Y d. determine the time of meridian transit 2258: The primary use of apparent time in marine navigation is to __________.
N a. calculate sunrise or sunset N b. determine zone time N c. enter an almanac Y d. determine the time of meridian transit 2409: You are approaching the first of two drawbridges that span a narrow channel. The second drawbridge is close to the first. Which signals should you sound?
N a. Sound the request-for-opening signal for the first bridge only, who will notify the second bridge of your approach N b. Sound the request-for-opening signal twice in succession to indicate you must pass through both bridges N c. Sound the request-for-opening signal, pause for about 10 seconds, then sound two prolonged blasts. Y d. Sound the request-for-opening signal and, after the bridge acknowledges it, sound the request-for-opening signal for the second bridge. 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 2424: Under the IALA-B Buoyage System, when entering from seaward a lateral system buoy to be left to starboard may display which of the topmarks shown? (D046NG )
Y a. A N b. B N c. C N d. D 2592: A deadhead is a(n) __________.
Y a. tree or log awash in a nearly vertical position N b. crew member who refuses to work N c. upstream end of a land wall N d. buoy that is adrift 2612: The dividing meridian between zone descriptions -7 and -8 is __________.
Y a. 112°30'E N b. 118°30'E N c. 120°00'E N d. 116°30'W 2739: A daymark used to indicate the starboard side of the channel when approaching from seaward will have the shape indicated by what letter in illustration D045NG?
N a. A N b. B N c. C Y d. D 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 2910: 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° N b. 45° Y c. 90° N d. 30° 3003: The height of tide is the __________.
Y a. difference between the depth of the water and the area's tidal datum N b. depth of water at a specific time due to tidal effect N c. difference between the depth of the water and the high water tidal level N d. difference between the depth of the water at high tide and the depth of the water at low tide 3060: What information is NOT found in the chart title?
N a. Survey information N b. Scale Y c. Date of first edition N d. Projection