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A grid reference given to six figures on a 1:50,000 sheet locates a point to within about

  • A.1 kilometre
  • B.1 metre
  • C.100 metres
  • D.10 metres

Answer: C

Three figures for each axis divide the one-kilometre square into tenths, giving a hundred-metre square. Adding a further pair of digits to make eight figures narrows it to ten metres, and each extra pair divides the square by ten again.

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