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Discussion

Portolan charts eventually surpassed earlier maps in accuracy chiefly through

  • A.the invention of the movable-type printing press
  • B.the adoption of a single projection
  • C.repeated revision and new compass surveys
  • D.the recovery of Ptolemy's tables

Answer: C

Correct answer: repeated revision and new compass surveys

Portolan charts were working documents, corrected by pilots against what they found on each voyage and drawn from compass bearings between harbours. That accumulation of practical observation produced Mediterranean coastlines of remarkable accuracy while the scholarly world maps of the same period remained schematic.

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