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Grid north differs from true north on a projected sheet because

  • A.meridians converge while grid lines stay parallel
  • B.the magnetic pole shifts its position from year to year
  • C.the survey datum differs from mean sea level slightly
  • D.the sheet has been printed very slightly askew

Answer: A

Correct answer: meridians converge while grid lines stay parallel

A grid is a square net laid on the projection, so its lines run parallel; meridians converge towards the pole. The angle between them - the grid convergence - is zero on the central meridian and grows towards the edges of the sheet, which is why it is stated in the marginal information.

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