MARINA Deck Reviewer 1-50

1) A gnomonic projection is based on a(n) __________. plane tangent at one point

2) A Mercator chart is a __________. cylindrical projection

3) Distance along a track line is measured on a Mercator chart by using the __________. latitude scale near the middle of the track line

4) For what purpose would using a Lambert conformal chart be more convenient than using a Mercator? Plotting radio bearings over a long distance

5) The scale of a Mercator projection is 4 inches equals 1°LONG. What is the expansion in inches between the 60th and 61st parallels? 8.11 inches

6) When navigating in high latitudes and using a chart based on a Lambert conformal projection, __________. a straight line drawn on the chart approximates a great circle

7) You would find the variation on a polyconic projection chart __________. on the compass rose

8) The principal feature of Mercator projection charts that makes them desirable for marine navigational use is that ________? courses and bearings are represented by straight lines

9) The usual method for using the gnomonic chart to determine the great circle track is _________? a straight line drawn between the departure and destination points

10) It is the ratio which is given by a length in any units on the chart, divided by the length on the earth's surface, in the same units, which that chartered length represents. This is represented as a fraction which the numerator equal to unity. natural scale

11) 15° of latitude is equal to __________. 900 miles

12) The only cylindrical chart projection widely used for navigation is the __________. Mercator

13) The value of sixty nautical miles per degree of geodetic latitude is most correct at __________. latitude 45°

14) When using a Lambert conformal chart in high latitudes, angles such as bearings are measured in reference to __________. the meridian through the ship's position

15) Which conic projection chart features straight lines which closely approximate a great circle? Lambert conformal

16) Which statement is TRUE concerning a Mercator projection? The length of the meridians is increased to provide for equal expansion in all directions.

17) 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? Oblique gnomonic

18) The shortest distance between any two points on earth defines a __________. great circle

19) When is the rhumb line distance the same as the great circle distance? Course 180°T when you cross the equator

20) The value of sixty nautical miles per degree of geodetic latitude is most correct at __________. latitude 45°

21) A chart projection depicting the poles and a small area on either side of a connecting meridian, that is sometimes used for star charts, is the __________. transverse Mercator projection

22) The scale on a chart is given as 1:5,000,000. This means that __________. 1 inch is equal to 5,000,000 inches on the Earth's surface

23) What area of the earth cannot be shown on a standard Mercator chart? North and South Poles

24) What defines a great circle? The shortest distance between any two points on the earth

25) A polyconic projection is based on a __________. series of cones tangent at selected parallels

26) For navigational purposes, each great circle on the Earth has a length of __________. 21,600 miles

27) In very high latitudes, the most practical chart projection is the __________. Lambert conformal

28) Which chart projection would be most suitable for marine surveying? Polyconic

29) Which statement about a gnomonic chart is correct? Parallels, except the equator, appear as curved lines.

30) Which statement about a simple conic chart projection is TRUE? The scale is correct along any meridian.

31) The distance between any two meridians measured along a parallel of latitude __________. decreases with increased latitude

32) What is NOT an advantage of the rhumb line track over a great circle track? Plots as a straight line on Lambert conformal charts

33) Which statement about a simple conic chart projection is TRUE? The scale is correct along any meridian.

34) A right-angled triangle may be formed on a mercator chart by__________ all of the options

35) The length of the arc of a meridian between the equator and a given parallel on a mercator chart in units of one minute of longitude at the equator. meridional part

36) A structure, usually made of stone, or cement pilings, which extends from the bank at approximately right angles to the current is called a __________. dike

37) A rock and sand structure extending from the bank of the river toward the channel is known as a __________. wingdam

38) A section of the river that is narrower than usual and is often navigable from bank to bank is a __________. chute

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

40) The chart indicates the variation was 3°45'W in 1988, and the annual change is decreasing 6'. If you use the chart in 1991 how much variation should you apply? 3°27'W

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

42) The shoreline on charts generally represents the mean __________. high water line

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

44) The survey information upon which a chart is based is found __________. near the chart title

45) A chart has extensive corrections to be made to it. When these are made and the chart is again printed, the chart issue is a __________. new edition

46) Charted depth is the __________. vertical distance from the chart sounding datum to the ocean bottom

47) In which source could you find the number of a chart for a certain geographic area? Catalog of Charts

48) Solid green arrows on the main body of a pilot chart indicate __________. prevailing ocean current directions

49) Some lights used as aids to marine navigation have a red sector to indicate a danger area. The limits of a colored sector of a light are listed in the Light List in which of the following manners? True bearings as observed from the ship toward the light

50) The depth of water on a chart is indicated as 23 meters. This is equal to __________. 12.6 fathoms