IB - Witness Posts versus Offset Posts

They look identical in the ground, but legally, they are worlds apart. We illuminate the critical distinction between a Witness Post (which testifies to the location of a specific corner) and an Offset Post (which marks a boundary line, but not a corner). Key Study Points: The Legal Difference: A Witness Post is tied to a specific point; an Offset Post defines a vector/line. Plan Drafting: How to correctly symbolize and annotate both types on a legal plan so they are never confused. The Exam Trap: Using an "Offset Post" to witness a corner, destroying the legal certainty of the intersecting boundary. Sources & Required Reading: ABCLS IB - Witness vs. Offset Posts Survey and Plan Rules 06 - PRM Chapter 7 (Field Work) 07 - PRM Chapter 8 (Principles of Boundary Surveys) Resources: IB PDF | Infographic | Quiz