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.
28: When using a buoy as an aid to navigation which of the following should be considered?
N a. The buoy should be considered to always be in the charted location. N b. If the light is flashing, the buoy should be considered to be in the charted location. Y c. The buoy may not be in the charted position. N d. The buoy should be considered to be in the charted position if it has been freshly painted. 46: What wind reverses directions seasonally?
Y a. Monsoon winds N b. Hooked trades N c. Jet stream N d. Secondary winds 112: Which chart number indicates an NGA (NIMA) chart designed for inshore coastwise navigation?
N a. LCORR5868 N b. COMBT800564 N c. 17XHA17365 Y d. 16ACO16595 220: At 0000 you fix your position and plot a new DR track line. At 0200 you again fix your position and it is 0.5 mile east of your DR. Which statement is TRUE?
N a. The current is westerly at 0.5 knot. N b. You must increase speed to compensate for the current. N c. The current cannot be determined. Y d. The drift is 0.25 knot. 229: The shoreline on charts generally represents the mean __________.
Y a. high water line N b. low water line N c. low water spring line N d. tide level 250: Weather systems in the middle latitudes generally travel from __________.
Y a. west to east N b. east to west N c. north to south N d. None of the above 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 438: Your longitude is 124°E, and your local mean time is 0520 on the 5th of the month. The mean time and date at Greenwich is __________.
N a. 1336 on the 4th N b. 1336 on the 5th Y c. 2104 on the 4th N d. 2104 on the 5th 492: Which type of projection is formed if a plane is tangent to the Earth, and points are projected geometrically from the center of the Earth?
N a. Lambert conformal Y b. Oblique gnomonic N c. Mercator N d. Transverse conic 497: What will be the time after 0300 (ZD +4), on 5 March 1983, when the height of the tide at Port of Spain, Trinidad, will be 2.5 feet (.76 meters) ?
N a. 0548 Y b. 0602 N c. 0618 N d. 0634 498: What is an advantage of the magnetic compass aboard vessels?
N a. Compass error is negligible at or near the earth's magnetic poles. N b. It does not have to be checked as often. Y c. It is reliable due to it's essential simplicity. N d. All points on the compass rose are readily visible. 503: You are approaching a light fitted with a RACON. The light may be identified on the radar by __________.
N a. a dashed line running from the center of the scope to the light N b. an audible signal when the sweep crosses the light N c. a circle appearing on the scope surrounding the light Y d. a coded signal appearing on the same bearing at a greater range than the light 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 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 720: Which change in the condition of the seas could indicate the formation of a tropical storm or hurricane several hundred miles from your location?
Y a. A long swell from an unusual direction N b. A lengthy lull in the wind and seas N c. Large seas coming from different directions N d. A brisk chop from the southeast 774: Variation is not constant; it is different with every change in __________.
N a. speed N b. vessel heading Y c. geographical location N d. cargo 782: Mariners are FIRST warned of serious defects or important changes to aids to navigation by means of __________.
Y a. marine broadcast Notice to Mariners N b. Weekly Notices to Mariners N c. corrected editions of charts N d. Light Lists 864: Uniform, grayish-white cloud sheets that cover large portions of the sky, and are responsible for a large percentage of the precipitation in the temperate latitudes, are called __________.
Y a. altostratus N b. altocumulus N c. cirrostratus N d. cirrocumulus 890: If several navigational lights are visible at the same time, each one may be positively identified by checking all of the following EXCEPT what against the Light List?
N a. Rhythm N b. Period Y c. Intensity N d. Color 957: The Humboldt Current flows in which direction?
Y a. North N b. South N c. East N d. West 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 997: A coastal current __________.
N a. is generated by waves striking the beach Y b. flows outside the surf zone N c. flows in a circular pattern N d. is also known as a longshore current 1058: You are preparing a weather report form, WS Form B-80. Your position is LAT 64°42'N, LONG 02°28'W. How would this be encoded? (D041NG )
N a. 90647, 90024 N b. 0647N, 00025 Y c. 99647, 70025 N d. 9064N, 9025W 1109: You are on course 146°T. To check the speed of your vessel you should observe a celestial body on which bearing?
N a. 000° N b. 056° N c. 090° Y d. 146° 1207: What will be the velocity of the tidal current at New London Harbor Entrance, CT, at 1615 EST (ZD +5) on 26 December 1983?
Y a. 0.2 knot N b. 0.4 knot N c. 0.7 knot N d. 0.9 knot 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 1307: What will be the velocity of the tidal current southwest of Hunts Point, NY, at 0932 EST (ZD +5) on 16 March 1983?
N a. 0.9 knot Y b. 1.5 knots N c. 1.8 knots N d. 2.3 knots 1351: Luminous range is the __________.
N a. maximum distance at which a light may be seen in clear weather Y b. maximum distance at which a light may be seen under existing visibility conditions N c. maximum distance at which a light may be seen considering the height of the light and the height of the observer N d. average distance of visibility of the light 1351: Luminous range is the __________.
N a. maximum distance at which a light may be seen in clear weather Y b. maximum distance at which a light may be seen under existing visibility conditions N c. maximum distance at which a light may be seen considering the height of the light and the height of the observer N d. average distance of visibility of the light 1406: What will act to dissipate fog?
N a. Upwelling cold water N b. Advection of warm air over a colder surface N c. Rain that is warmer than air Y d. Downslope motion of an air mass along a coast 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 1438: In the Northern Hemisphere you are caught in the dangerous semicircle of a storm with plenty of sea room available. The best course of action is to bring the wind on the __________.
N a. port quarter and make as much headway as possible N b. starboard quarter and make as much headway as possible Y c. starboard bow and make as much headway as possible N d. port bow and make as much headway as possible 1442: A great circle track provides the maximum saving in distance on __________.
Y a. easterly courses in high latitudes N b. southerly courses in high latitudes N c. westerly courses in low latitudes N d. easterly courses in low latitudes that cross the equator 1447: What will be the velocity of the tidal current 6 miles south of Shoal Point, NY, at 1850 DST (ZD +4) on 9 July 1983?
N a. 0.2 knot ebb Y b. 0.2 knot flood N c. 1.2 knot ebb N d. 1.4 knot flood 1475: Which type of cloud is the classic "thunderhead"?
Y a. Cumulonimbus N b. Stratus N c. Cirrus N d. Altostratus 1542: To find a magnetic course from a true course you must apply __________.
N a. magnetic anomalies (local disturbances) N b. deviation Y c. variation N d. deviation and variation 1602: Most modern Loran-C receivers automatically detect secondary station blink which __________.
N a. indicates the station is transmitting normally N b. automatically shuts down the receiver Y c. triggers alarm indicators to warn the operator N d. causes the receiver to shift automatically to another Loran chain 1629: Air temperature varies with __________.
N a. the altitude above sea level N b. the season of the year N c. the latitude or distance from the equator Y d. All of the above 1751: A tsunami is caused by a(n) __________.
N a. tidal wave N b. storm surge caused by a hurricane or tropical storm Y c. earthquake on the ocean's floor N d. tornado 1775: The letter A in illustration D006NG represents the __________.
N a. celestial horizon N b. geoidal horizon Y c. sensible horizon N d. visible horizon 1831: IN REGION A of the IALA Buoyage System, when entering from seaward, the port side of a channel would be marked by a __________.
N a. red conical buoy N b. black can buoy Y c. red can buoy N d. black conical buoy 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. 1918: The Moon appears larger in diameter at the zenith than when near the horizon. What is this called?
N a. Parallax in altitude Y b. Augmentation N c. Horizontal parallax N d. Libration 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 2102: The subregions of the United States Gulf and East Coasts are numbered 11, 12 and 13 within the chart numbering system. Which chart number indicates a chart for either the Gulf or East Coast?
N a. 21214 Y b. 11314 N c. 14313 N d. 14114 2229: A vessel is heading magnetic north and its magnetic compass indicates a heading of 003°. What action should be taken to remove this error during compass adjustment?
Y a. If the red ends are to port the athwartships magnets should be raised. N b. If the blue ends are to port the athwartships magnets should be raised. N c. If the red ends are forward the fore-and-aft magnets should be lowered. N d. If the blue ends are forward the fore-and-aft magnets should be raised. 2505: At the approaches to Savannah, GA, with the wind coming out of the west, the wind-driven current will be flowing approximately __________.
N a. 280° N b. 260° N c. 100° Y d. 080° 2529: A bridge over a navigable waterway is being repaired. There is a traveler platform under the bridge's deck that significantly reduces the vertical clearance. If required by the CG district commander, how will this be indicated at night?
N a. Illumination by flood lights Y b. A quick flashing red light at each lower corner N c. A strobe light visible both up and downstream N d. Fixed amber lights under the extreme outer edges of the traveler 2625: Stormy weather is usually associated with regions of __________.
N a. high barometric pressure N b. changing barometric pressure Y c. low barometric pressure N d. steady barometric pressure 2632: A section of the river that is narrower than usual and is often navigable from bank to bank is a __________.
Y a. chute N b. stabilized channel N c. slough N d. navigable pass 2821: The height of tide is the __________.
N a. difference between the depth of the water at high tide and the depth of the water at low tide N b. depth of water at a specific time due to tidal effect Y c. difference between the depth of the water and the area's tidal datum N d. difference between the depth of the water and the high water tidal level 2826: You take a bearing of 043° and 169° of two objects. What bearing of a third object will give the best fix?
N a. 356° Y b. 102° N c. 144° N d. 201° 2895: A white buoy with an orange rectangle on it is a(n) __________.
N a. junction buoy N b. safe water buoy Y c. informational buoy N d. All of the above 2909: A nun buoy is indicated by which letter in illustration D044NG?
N a. A N b. B N c. C Y d. D 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 2949: On 13 November 1981 you observe a back sight of the upper limb of the Sun. The sextant altitude (hs) is 109°26.3'. The height of eye is 66 feet, and the index error is 2.0' on the arc. What is the observed altitude (HO)?
N a. 70°56.6' N b. 70°38.0' Y c. 70°27.2' N d. 70°23.2' 2959: Vessels required to have an Automatic Radar Plotting Aid must have a device to indicate the __________.
N a. time of the next navigational satellite N b. distance to the next port Y c. speed of the vessel over the ground or through the water N d. None of the above 3022: A green-and-red banded daymark, green band uppermost, will have the shape shown at letter __________. (D045NG )
Y a. A N b. B N c. C N d. D 3037: The letter H in illustration D006NG represents the __________.
Y a. visible horizon N b. celestial horizon N c. geoidal horizon N d. refractive horizon