4 Disadvantages of using prismatic compass surveying




Prismatic compass surveying is the method of surveying in which the direction of surveying lines and angular measurements are determined with a magnetic compass and the length of surveying lines are measured with a tape or chain.

The following are disadvantages/demerits of using prismatic compass surveying

  • can not be conducted in areas known to have magnetic materials
  • demand knowledge especially about rocks to identify the presence of iron ore
  • it is difficult to hold the compass absolutely steady when taking the bearing hence it is impossible to eliminate the errs completely
  • prismatic compass surveying is not useful over long distances

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