National Maritime Center

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1 National Maritime Center Providing Credentials to Mariners (Sample Examination) Page 1 of 13

2 Choose the best answer to the following Multiple Choice Questions. 1. What is the approximate geographic range of Horton Point Light, NY, if your height of eye is 40 feet (12.2 meters)? Refer to "Reprints from the LIGHT LISTS AND COAST PILOTS". o (A) 18.8 nm (B) 19.3 nm o (C) 20.3 nm o (D) 24.8 nm 2. The points on the earth's surface where the magnetic dip is 90 are. o (A) connected by the isoclinal line o (B) along the magnetic equator o (C) the isopors (D) the magnetic poles 3. Your vessel is on course 270 T, speed 10 knots. The apparent wind is from 10 off the port bow, speed 30 knots. From which direction is the true wind? o (A) 345 T (B) 255 T o (C) 075 T o (D) 165 T 4. A radar range to a small, charted object such as a light will provide a line of position in which form? o (A) Straight line o (B) Parabola o (C) Hyperbola (D) Arc 5. You are on course 238 T. To check the course of your vessel you should observe a celestial body on which bearing? o (A) 180 o (B) 238 (C) 328 o (D) 090 Page 2 of 13

3 6. A local wind which occurs during the daytime and is caused by the different rates of warming of land and water is a. o (A) chinook o (B) foehn (C) sea breeze o (D) land breeze 7. A preferred-channel buoy will show a. (A) composite group-flashing (2 + 1) red or green light o (B) white light whose characteristic is Morse (A) o (C) composite group-flashing (2 + 1) white light o (D) group-occulting white light 8. When a cold air mass and a warm air mass meet, and there is no horizontal motion of either air mass, it is called a(n). o (A) cold front o (B) occluded front o (C) warm front (D) stationary front 9. A special mark (yellow buoy), if lighted, may exhibit which light rhythm? o (A) Occulting o (B) Morse "A" (C) Flashing o (D) Equal interval 10. The datum from which the predicted heights of tides are reckoned in the tide tables is the same as that used for the charts of the locality. The depression of the datum below mean sea level for Hampton Roads, Virginia is. o (A) between -.7 and +.5 feet o (B) between 1.9 and 3.2 feet o (C) 4.1 feet (D) 1.2 feet Page 3 of 13

4 11. The Light List indicates that a light has a nominal range of 14 miles and is 26 feet high. If the visibility is 4 miles and your height of eye is 20 feet, at what approximate distance will you sight the light? (A) 7.5 miles o (B) 9.6 miles o (C) 11.2 miles o (D) 14.0 miles 12. A hygrometer is a device used for determining. (A) relative humidity o (B) the absolute temperature o (C) atmospheric pressure o (D) wind velocity 13. Weather information is available from. o (A) the Coast Guard on scheduled marine information broadcasts o (B) commercial radio broadcasts o (C) VHF-FM continuous marine weather broadcasts provided by the National Weather Service (D) All of the above 14. As the temperature for a given mass of air increases, the. o (A) dew point decreases o (B) dew point increases (C) relative humidity decreases o (D) relative humidity increases 15. What volume of the Coast Guard Light List is used for the Mississippi River system? o (A) IV o (B) I (C) V o (D) II Page 4 of 13

5 16. A buoy marking a wreck will show a(n). o (A) occulting green light and may be lettered (B) white light FL (2) and a topmark of 2 black spheres o (C) continuous quick white light and may be numbered o (D) yellow light and will be numbered 17. What do the numbers on isobars indicate? o (A) temperature o (B) rain in inches o (C) wind speed (D) barometric pressure 18. An orange and white buoy marking an area where operating restrictions are in effect will be marked with which symbol? o (A) Rectangle o (B) Diamond with a cross (C) Circle o (D) Open-faced diamond 19. On mid-ocean waters, the height of a wind-generated wave is not affected by the. o (A) wind's velocity (B) water depth exceeding 100 feet o (C) fetch o (D) duration of the wind 20. Your ARPA has two guard zones. What is the purpose of the inner guard zone? o (A) Sound an alarm for targets first detected within the zone o (B) Alert the watch officer that a vessel is approaching the preset CPA limit o (C) Guard against target loss during critical maneuvering situations (D) Warn of small targets that are initially detected closer than the outer guard zone Page 5 of 13

6 21. You are inbound in a channel marked by a range. The range line is 040 T. You are steering 036 T. The range is in sight as shown in illustration D047NG below, and is closing. Which action should you take? (A) Continue on course until the range is closed, then alter course to the right. o (B) Immediately alter course to the right to bring the range in line. o (C) Immediately alter course to 040 T. o (D) Continue on the present heading until the range is in line then alter course to the left. 22. Under the IALA Buoyage Systems, the topmark of a red and white vertically-striped buoy shall be. o (A) X-shaped (B) a single red sphere o (C) a single red cone o (D) two black spheres 23. The permanent magnetism of a vessel may change in strength due to. (A) major structural repair o (B) the nature of the cargo being carried o (C) changes in heading o (D) All of the above 24. On the Corps of Engineer's Navigation Maps, the channel is. o (A) indicated by depths (in feet) (B) indicated by a broken line o (C) midway between the banks o (D) not indicated 25. The climate of the northern Gulf coast. o (A) has an east coast marine type of climate (B) is a warm marine type of climate o (C) is humid and subtropical throughout the year o (D) varies from warm to subtropical Page 6 of 13

7 26. You are heading out to sea in a buoyed channel and see a quick flashing green light on a buoy ahead of you. In U.S. waters, you should leave the buoy. (A) to starboard o (B) about 50 yards off on either side o (C) well clear on either side o (D) to port 27. Under the IALA Buoyage Systems, a cardinal mark may NOT be used to. o (A) draw attention to a feature in the channel such as a bend, junction, bifurcation, or end of a shoal (B) indicate the port and starboard sides of well-defined channels o (C) indicate that the deepest water in an area is on the named side of the mark o (D) indicate the safe side on which to pass a danger 28. A source of an air mass labeled mtw is. o (A) the equator (B) the Gulf of Mexico o (C) Alaska o (D) Canada 29. Which condition(s) is(are) necessary for the formation of dew? o (A) Earth's surface cooler than the dew point of the air o (B) Clear skies o (C) Calm air (D) All of the above 30. A current perpendicular to a vessel's track has the greatest effect on the vessel's course made good. (A) at low vessel speeds o (B) at high vessel speeds o (C) in deep water o (D) in shallow water Page 7 of 13

8 31. A single line of position combined with a dead-reckoning position results in a(n). o (A) fix o (B) assumed position (C) estimated position o (D) running fix 32. All echo-sounders can measure the. o (A) average depth of water to soft bottom (B) actual depth of water below keel o (C) average depth from waterline to hard bottom o (D) actual depth of water 33. An important lunar cycle affecting the tidal cycle is called the nodal period. How long is this cycle? o (A) 16 days (B) 19 years o (C) 6 years o (D) 18 days 34. The speed of sound in water is approximately. o (A) 1.5 times its speed in air o (B) 2.5 times its speed in air o (C) 3.5 times its speed in air (D) 4.5 times its speed in air 35. Which item in illustration D034NG below shows a Morse (A) light? o (A) A o (B) B o (C) C (D) D Page 8 of 13

9 36. Which type of cloud formation should be of immediate concern to small craft operators? (A) cumulonimbus o (B) cirrus o (C) altostratus o (D) nimbostratus 37. Which feature, when set to zero, might allow a GPS unit to have an accuracy equivalent to Precise Positioning Service receiver capability? o (A) Transit o (B) Anti-spoofing o (C) Auto-correlation (D) Selective Availability 38. The rise and fall of the ocean's surface due to a distant storm is known as. (A) swell o (B) sea o (C) waves o (D) fetch 39. What kind of pressure systems travel in tropical waves? o (A) Subsurface pressure o (B) High pressure (C) Low pressure o (D) Terrastatic pressure 40. When your vessel is on the storm track but behind the storm's center the. o (A) wind direction remains steady o (B) wind speed decreases o (C) barometer rises (D) All of the above Page 9 of 13

10 41. In the IALA Maritime Buoyage System, what is a red and white vertically-striped buoy used to indicate? o (A) isolated danger mark o (B) special mark not primarily used for navigation o (C) cardinal mark (D) safe water mark 42. What publication contains descriptions of the coast line, buoyage systems, weather conditions, port facilities, and navigation instructions for the United States and its possessions? (A) Coast Pilots o (B) Light List o (C) Port Index o (D) Sailing Directions 43. The Coast Guard Captain of the Port has excluded all traffic from a section of a port, while a regatta is taking place. The buoys marking this exclusion area will be. o (A) marked with a spherical topmark o (B) nun- or can-shaped to conform to the overall direction of navigation (C) orange and white o (D) yellow 44. A millibar is a unit of. (A) pressure o (B) precipitation o (C) humidity o (D) temperature 45. Which statement about gyrocompass error is TRUE? o (A) Any error will remain constant unless the compass is stopped and restarted. o (B) Any error shown by a gyro repeater will be the same as the error of the master compass. o (C) The sign (E or W) of the error will change with different headings of the ship. (D) The amount of the error and the sign will generally be the same on all headings. Page 10 of 13

11 46. What will act to dissipate fog? o (A) Rain that is warmer than air o (B) Upwelling cold water o (C) Advection of warm air over a colder surface (D) Downslope motion of an air mass along a coast 47. The atmosphere in the vicinity of a high pressure area is called a(n). o (A) cold front o (B) occluded front o (C) cyclone (D) anticyclone 48. At the outbreak of war your ship is caught in an enemy port. Which statement is FALSE? o (A) You should attempt to contact U.S. Consular officials. o (B) You should attempt to clear for sea before your ship is interned. (C) You should resist boarding by local officials. o (D) You should try to send a Ship Hostile Action Report to the NGA (formerly NIMA). 49. Under the IALA-B Buoyage System, a buoy displaying a red light will. o (A) be lettered (B) be left to starboard when entering from seaward o (C) show a light characteristic of Morse Code "A" o (D) have a radar reflector 50. Which type of daymark is used to mark the starboard side of the channel when entering from sea? o (A) Red and white octagon (B) Red triangle o (C) Green square o (D) Black and white diamond Page 11 of 13

12 National Maritime Center Providing Credentials to Mariners D034NG 5/23/2016 Adapted for testing purposes only Further reproduction prohibited without permission Page 12 of 13

13 National Maritime Center Providing Credentials to Mariners D047NG 5/23/2016 Adapted for testing purposes only Further reproduction prohibited without permission Page 13 of 13

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