MARINA Deck Reviewer 51-100

51) The reference datum used in determining the heights of land features on most charts is __________. mean high water

52) What is the most important source of information to be used in correcting charts and keeping them up to date? Notice to Mariners

53) Which aid is NOT marked on a chart with a magenta circle? Aero light

54) The revision date of a chart is printed on which area of the chart? Lower-left corner

55) Which factor(s) is/are used to develop the charted information of a lighthouse? Height and brightness of the light

56) Which information is found in the chart title? Chart sounding datum

57) You are underway in a vessel with a draft of 6.0 feet. You are in an area where the charted depth of the water is 4 fathoms. You would expect the depth of water beneath your keel to be approximately __________. 18 feet

58) Where do you write the note that the chart has been corrected? at the left lower corner

59) The depth of the water is indicated on a chart as 32 meters. This is equal to __________. 17.50 fathoms

60) A channel is stated as having a controlling depth of 38 feet. Which statement is TRUE? 100% of the channel width is clear to 38 feet.

61) Charts should be corrected by using information published in the __________. Notice to Mariners

62) Entering from sea, a daymark on the port side of the channel would be indicated on a chart by a __________. green square with the letter G

63) Some lights used as aids to marine navigation have a red sector to indicate a danger area. How are the limits of a colored sector of light listed in the Light List? True bearings as observed from a vessel toward the light

64) The chart indicates the variation was 3°45'W in 1988, and the annual change is increasing 6'. If you use the chart in 1991 how much variation should you apply? 4°03'W

65) The description "Racon" beside an illustration on a chart would mean a __________. radar transponder beacon

66) What information is NOT found in the chart title? Date of first edition

67) Your chart indicates that there is an isolated rock and names the rock using vertical letters. This indicates the __________. rock is dry at high water

68) The agonic line on an isomagnetic chart indicates the __________. points where there is no variation

69) What information is found in the chart title? Information on the sounding datum

70) Which aid is NOT marked on a chart with a magenta circle? Aero light

71) Which symbol represents a 10-fathom curve? ____ . _____ . ____ . ____

72) A revised print of a chart is made __________. when a low-stock situation occurs and minor corrections are made

73) The description "Racon" beside an illustration on a chart would mean a radar transponder beacon

74) The description "Racon" beside an illustration on a chart would mean a __________. radar transponder beacon

75) Chart legends printed in capital letters show that the associated landmark is __________. conspicuous

76) Chart legends which indicate a conspicuous landmark are printed in __________. capital letters

77) Clearance gauges at bridges indicate __________. distance from the water to low steel of the bridge

78) Red sectors of navigation lights warn mariners of __________. shoals or nearby land

79) The buoy symbol printed on your chart is leaning to the northeast. This indicates __________. nothing special for navigational purposes

80) The chart indicates the variation was 3°45'E in 1988, and the annual change is increasing 6'. If you use the chart in 1991 how much variation should you apply? 4°03'E

81) The controlling depth of the river is __________. the least available water in a channel which limits the draft of boats and tows

82) The numeral in the center of a wind rose circle on a pilot chart indicates the __________. percentage of calms

83) The shoreline shown on nautical charts of areas affected by large tidal fluctuations is usually the line of mean __________. high water

84) When slanted letters are used to spell the name of a charted object you know the __________. object may cover and uncover with the tide

85) Which information is found in the chart title? Survey information

86) Which symbol represents a 2-fathom curve? .. .. .. .. ..

87) You are underway and pass by a lighthouse. Its light, which was white since you first sighted it, changes to red. This means __________. you have entered an area of shoal water or other hazard

88) A great circle crosses the equator at 134°E. It will also cross the equator at what other longitude? 46°W

89) A great circle crosses the equator at 173°E. It will also cross the equator at what other longitude? 7°W

90) A great circle track provides the maximum saving in distance on __________. easterly courses in high latitudes

91) A line of position from a celestial observation is a segment of a __________. circle of equal altitude

92) The distance to the nearest vertex from any point on a great circle track cannot exceed __________. 5400 nautical miles

93) The upper vertex of a great circle track is in LONG 156°00'E. Sailing eastward, the great circle track will cross the equator in LONG __________. 114°00'W

94) The vertex of a great circle track is in LONG 109°E. An eastbound vessel would cross the equator in LONG __________. 161°W

95) You determine your vessel's position by taking a range and bearing to a buoy. Your position will be plotted as a(n) __________. estimated position

96) What is the major advantage of a rhumb line track? The vessel can steam on a constant heading (disregarding wind, current, etc.).

97) A great circle crosses the equator at 93°W. It will also cross the equator at what other longitude? 87°E

98) A line on the Earth parallel to the equator is a __________. small circle

99) A plane that cuts the Earth's surface at any angle and passes through the center will always form __________. a great circle

100) Except for N-S courses, and E-W courses on the equator, a great circle track between two points, when compared to a rhumb line track between the same two points, will __________. always be nearer to the elevated pole