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2 cards from this section. Quick, good the night before a test.
What is local attraction in surveying?
Think about what might interfere with a compass reading.
Name two objects that can cause local attraction.
Consider common materials found in construction or around buildings.
What does local attraction refer to in surveying?
Think about what nearby elements could interfere with compass accuracy.
True or False: The fore bearing and back bearing of a line should ideally differ by 180°.
Recall the purpose of measuring both bearings.
You have a surveying site where local attraction is suspected due to nearby steel structures. After measuring, the fore bearing is 230° and the back bearing is found to be 30°. Compute the degree of error and suggest a plan to mitigate future inaccuracies.
Understand the relationship between fore and back bearing and what they're supposed to sum to.
In a previous survey, a team recorded many local attractions which resulted in discrepancies. Discuss the importance of educating all team members about identifying and handling local attraction.
Consider the importance of communication and training in technical fields.
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