4 principles 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 principles of prismatic compass surveying

  • Make sure that there is no magnetic materials to avoid incorrect reading
  • the prismatic compass should be held steady to avoid the accumulation of errors
  • avoid wearing wrist watches
  • check the accuracy of instruments like compass, chain and tape before using them

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