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How were the gnomonic and Mercator projections used together in navigation?

  • A.Both were used to plot the bearings, as a cross-check
  • B.The gnomonic gave scale and the Mercator gave area
  • C.The Mercator gave the route and the gnomonic the compass course
  • D.The route was plotted on one and the bearings read from the other

Answer: D

The great-circle route is a straight line on the gnomonic, and transferring points from it to a Mercator chart turns that route into a series of constant-bearing legs. Each projection supplies exactly what the other cannot.

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