IB - Witness Posts - Survey and Plan Rule - v1.3
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What do you do when the true corner is in the middle of a river or inside a concrete pillar?
We shed light on the strict rules for "Witness Posts."
Learn how to properly monument, mark, and record a W.T. on your plan so future surveyors can find the invisible corner.
Key Study Points:
When to Witness: The criteria for when a true corner is "inaccessible."
Marking Requirements: The specific "W.T." stamping and bearing/distance inscriptions required on the post.
The Exam Trap: Placing a witness post too far from the true corner, violating the SPR distance limitations.
Sources & Required Reading:
ABCLS IB - Witness Posts
Survey and Plan Rules
06 - PRM Chapter 7 (Field Work)
07 - PRM Chapter 8 (Principles of Boundary Surveys)
Resources: IB PDF | Infographic | Quiz
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