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.
23: If Loran-C signals become unsynchronized, the receiver operator is warned because __________.
Y a. signals begin to blink N b. signals begin to shift N c. stations discontinue transmission N d. stations transmit grass 69: The parallax angle will vary the most with the time of year for __________.
Y a. Venus N b. Jupiter N c. Saturn N d. Polaris 121: A safe water mark may be __________.
N a. vertically striped N b. spherical N c. showing a white light Y d. All of the above 230: If the LORAN-C ground wave does NOT extend out as far as the skywave skip distance, there will be a skip zone in which __________.
Y a. no LORAN-C signal is received N b. only ground waves are received N c. only skywaves are received N d. both ground waves and skywaves are received 304: In order to remove index error from a sextant, you should adjust the __________.
N a. index mirror to make it parallel to the horizon glass with the index set at zero Y b. horizon glass to make it parallel to the index mirror with the index set at zero N c. horizon glass to make it parallel to the sextant frame N d. telescope to make it perpendicular to the sextant frame 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 334: The index error is determined by adjusting the __________.
N a. sextant frame N b. horizon glass N c. index mirror Y d. micrometer drum 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) 469: Where are the prevailing westerlies of the Southern Hemisphere located?
N a. Between the Equator and 10° latitude N b. Between 10° and 20° latitude Y c. Between 30° and 60° latitude N d. Between 60° and 90° latitude 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° 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 669: It is desirable that a vessel encountering hurricane or typhoon conditions sends weather reports to the closest meteorological service at least every __________.
N a. hour Y b. 3 hours N c. 6 hours N d. 8 hours 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. 771: Under the IALA Buoyage Systems, a spherical buoy will mark the __________.
Y a. safe water N b. port side of the channel N c. a hazard to navigation N d. the position of an underwater cable 791: Under the IALA Buoyage Systems, the topmark of a red and white vertically-striped buoy shall be __________.
N a. X-shaped N b. two black spheres Y c. a single red sphere N d. a single red cone 822: Charts should be corrected by using information published in the __________.
N a. Light List N b. American Practical Navigator Y c. Notice to Mariners N d. Coast Pilot 915: The Sun's center may be coincident with both the celestial equator and the observer's prime vertical circle when __________.
N a. it crosses the December solstitial point N b. it crosses the June solstitial point N c. it is in upper transit Y d. its declination is zero 928: The position labeled "D" was plotted because __________. (D051NG )
Y a. a dead reckoning position is plotted for each course change N b. a dead reckoning position is plotted within 30 minutes of a running fix N c. the vessel's speed changed at 1125 N d. All of the above 939: That half of the hurricane to the right hand side of its track (as you face the same direction that the storm is moving) in the Northern Hemisphere is called the __________.
N a. windward side N b. leeward side N c. safe semicircle Y d. dangerous semicircle 960: The Light List shows that a navigational light has a nominal range of 15 miles and a height above water of 29 feet (8.8 meters). Your height of eye is 52 feet (15.8 meters) and visibility is 6.0 miles. At which approximate range will you first sight the light?
N a. 8.0 miles Y b. 11.0 miles N c. 14.5 miles N d. 16.0 miles 1025: A first magnitude star is __________.
Y a. 2.5 times as bright as a second magnitude star N b. 3 times as bright as a second magnitude star N c. 5 times as bright as a second magnitude star N d. 10 times as bright as a second magnitude star 1028: At what angle to the isobars do surface winds blow over the open sea?
N a. About 90° N b. About 50° N c. About 25° Y d. About 15° 1092: The wind velocity is higher in the dangerous semicircle of a tropical cyclone because of the __________.
N a. extension of the low pressure ridge Y b. wind circulation and forward motion of the storm N c. recurvature effect N d. direction of circulation and pressure gradient 1134: The Earth's irregular heating is caused by __________.
N a. the time of day N b. the seasons N c. geography Y d. All of the above 1151: Buoys are marked with reflective material to assist in their detection by searchlight. Which statement is TRUE?
N a. A safe-water buoy will display red and white vertical stripes of reflective material. N b. All reflective material is white because it is the most visible at night. N c. A special-purpose mark will display either red or green reflective material to agree with its shape. Y d. A preferred-channel buoy displays either red or green reflective material to agree with the top band of color. 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 1175: Solid green arrows on the main body of a pilot chart indicate __________.
N a. prevailing wind directions Y b. prevailing ocean current directions N c. probable surface current flow N d. shortest great circle routes 1177: The magnitude of three stars is indicated. Which star is the brightest?
Y a. Canopus - 0.9 N b. Vega + 0.1 N c. Antares + 1.2 N d. Cannot be determined; magnitude indicates size not brightness 1197: Off Fire Island, NY with winds from the southwest, the average wind-driven current flows in a direction of __________.
N a. 014° Y b. 076° N c. 170° N d. 256° 1221: On a chart, the characteristic of the light on a lighthouse is shown as flashing white with a red sector. The red sector __________.
N a. indicates the limits of the navigable channel Y b. indicates a danger area N c. is used to identify the characteristics of the light N d. serves no significant purpose 1235: Weather information provided by the National Weather Service (NWS) advisories should be used along with __________.
N a. the Tide Tables and Tidal Current Tables N b. the local Notice to Mariners Y c. weather maps and local knowledge N d. any U.S. Coast Pilot 1248: On 6 July 1983, at 1520 DST (ZD +4) what will be the predicted height of tide at Newburgh, NY?
N a. 2.1 feet N b. 1.7 feet N c. 1.2 feet Y d. 0.6 foot 1335: Plain language is usually used on marine weather __________.
Y a. forecasts N b. observations N c. analyses N d. reports 1342: An occluded front on a weather map is colored __________.
N a. blue line Y b. purple line N c. dashed blue line N d. alternate red and blue line 1358: Despite weather predictions for continued good weather, a prudent mariner should be alert for all of the following, EXCEPT a sudden __________.
N a. drop in barometric pressure Y b. drop in temperature N c. wind shift N d. squall line 1364: The Sailing Directions are published in the Enroute format and the __________.
N a. Coastal editions N b. World Port Index N c. Pilot format Y d. Planning Guide 1385: What is the length of the lunar day?
Y a. 24h 50m 00s N b. 24h 00m 00s N c. 23h 56m 04s N d. 23h 03m 56s 1744: Which condition suggests that your present position lies in the navigable semicircle of a tropical storm?
Y a. A backing wind N b. A veering wind N c. Sustained gale force winds N d. A strong wind that maintains a constant speed and direction 1780: While in port, you can follow the approach of a dangerous cyclonic storm by inspecting __________.
N a. the Coast Pilot or Sailing Directions N b. the National Weather Service Observing Handbook No.1, Marine Surface Observations Y c. a newspaper N d. the sky overhead 1815: Which weather system produces strong cold winds called "Northers" during the winter months in the Gulf of Mexico?
Y a. An anticyclone N b. A polar maritime air mass N c. A cyclone N d. A low pressure system 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 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 1850: A vessel heading WNW is on a course of __________.
N a. 270.0° Y b. 292.5° N c. 315.0° N d. 337.5° 1954: In the horizon system of coordinates what is equivalent to the poles on the Earth?
N a. Celestial poles Y b. Zenith, nadir N c. Ecliptic poles N d. Nodes 1986: The Moon is farthest from the Earth at __________.
N a. the full Moon Y b. apogee N c. the lunar solstice N d. quadrature 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 2140: The visible range marked on charts for lights is the __________.
N a. minimum distance at which the light may be seen with infinite visibility N b. minimum distance at which the light may be seen based on a 12 mile distance to visible horizon N c. maximum distance the light may be seen restricted by the height of the light and the curvature of the earth Y d. maximum distance at which a light may be seen in clear weather with 10 miles visibility 2199: Denebola is found in what constellation?
N a. Hydrus Y b. Leo N c. Centaurus N d. Aquila 2498: The light characteristic of flashing is used in the Aids to Navigation System on the Western Rivers for lights on __________.
Y a. the right descending bank N b. the left descending bank N c. preferred channel buoys N d. daymarks with no lateral significance 2502: The major factor that causes the color difference between a red star (Betelgeuse) and a blue star (Rigel) is __________.
Y a. its surface temperature N b. the elevation above the horizon N c. the mass of the star N d. the contrast to nearby stars 2524: What is the equivalent of 2° 35' in time units?
Y a. 10 min. 20 sec. N b. 9 min. 10 sec. N c. 7 min. 06 sec. N d. 6 min. 43 sec. 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 2668: You are approaching a drawbridge and have sounded the request-for-opening signal. The bridge has responded with five short blasts. What reply should you sound?
N a. None; No reply is required Y b. Five short blasts N c. Two prolonged blasts N d. One prolonged, one short blast 2672: When you are steering on a pair of range lights and find the upper light is in line above the lower light, you should __________.
Y a. continue on the present course N b. come left N c. come right N d. wait until the lights are no longer in a vertical line 2711: Information about currents on the Pacific Coast of the U. S. are found in the __________.
Y a. Tidal Current Tables N b. Nautical Almanac N c. Tide Tables N d. Ocean Current Tables 2719: Under the U.S. Aids to Navigation System on the Western Rivers, passing daymarks on the right descending bank are __________.
N a. red diamond-shaped panels with red reflector borders N b. red triangular-shaped panels with red reflector borders Y c. green square-shaped panels with green reflector borders N d. green triangular-shaped panels with green reflector borders 2729: While navigating in fog off a coastline of steep cliffs, you hear the echo of the ships fog horn 5.5 seconds after the signal was sounded. What is the distance to the shore?
N a. 3825 ft (1166 meters) N b. 3450 ft (1052 meters) Y c. 3072 ft (936 meters) N d. 2475 ft (754 meters) 2804: The altitude at LAN may be observed by starting several minutes in advance and continuing until a maximum altitude occurs. This procedure should not be used __________.
N a. when the declination and latitude are of different names N b. when the declination is greater than and the same name as the latitude N c. if the vessel is stopped or making bare steerageway Y d. on a fast vessel on northerly or southerly headings 2884: The pictures shown represent the geographic location of a vessel and the radar presentation at the same time. Which statement is TRUE? (D011NG )
Y a. Ship No. 1 does not appear as an individual target due to the effect of beam width. N b. Small island is not detected due to the multiple echo effect from the mountain. N c. A tangent bearing of the headland to the south-southeast is corrected by subtracting one-half of the beam width. N d. Ship No. 2 is not detected due to the side lobe effect of radar reflecting from the mountain. 3012: The draw span of a floating drawbridge may be marked with __________.
Y a. a yellow light showing Morse Code (B) N b. a yellow and white diamond N c. flashing blue lights N d. three red lights on each side of the draw