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What is the convergency factor on a Direct Mercator projection?
  • A
    0
  • B
    It varies as it is dependent on the latitude.
  • C
    The convergency factor is infinite.
  • D
    1
PROPERTIES OF A MERCATOR CHART  
ScaleCorrect on the Equator. 
Elsewhere increases as the secant of the latitude. Within 1% up to 8° from the Equator.		 
OrthomorphicYes. All charts used for navigation must be. 
GraticuleMeridians are straight parallel lines, evenly spaced. 
Parallels are straight parallel lines with the space between them increasing with the secant of the latitude.		 
ShapesReasonably correct over small areas. 
Distortion over large areas, especially at high latitudes.		 
Chart ConvergenceZero everywhere. Correct at the Equator. 
Constant across the chart.		 
Rhumb linesStraight lines Always! Everywhere! 
Great circlesEquator and meridians are straight lines (because they are also rhumb lines). All other great circles - curves, with a track nearer the Pole (or concave to the Equator). 

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