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