4 DISADVANTAGES OF 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 errors completely

  • prismatic compass surveying is not useful over long distances

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