Pincushion Corners: How They Happen — and How Mentorship Can Stop Them Introduction If you've ever dug around a corner monument and found three, four, or even ten separate pins all within a couple of feet of each other, congratulations—you've encountered one of the land surveying profession's most persistent and damaging phenomena: the pincushion corner. It’s one of the most visible signs of disunity in our field. Not only does it confuse property owners, courts, and future s...urveyors—it directly undermines public confidence in what we do.

And yet, it keeps happening, decade after decade, across urban subdivisions, rural metes-and-bounds, and everywhere in between. This article explores the why, the how, and—most importantly—how we fix it, not just through better tools or tighter rules, but through mentorship and professional growth. A pincushion corner is the result of multiple surveyors, over time, setting their own physical corner monuments—iron rods, pipes, caps, etc.—in the same general location, but not in agreement with one another.





You’ll find one pin set in the 1970s, another in the 90s, maybe two more from the 2000s, and a fresh one from last week—all within a foot or two of each other. Each surveyor likely believed they had the “right” spot. But only one of those pins—if any—accurately reflects the true boundary corner based on the legal, historical, and physical evidence available.The Damage It DoesBreeds distrust — Courts, attorneys, and the public begin to see surveying as arbitrary.Increases costs — Future retracements become more difficult and expensive.Erodes the profession — When we don’t agree on corners, we lose our authority as boundary experts.How Pincushion Corners Happen To fix the problem, we must understand its causes.

Pincushioning is not random—it’s rooted in psychology, training gaps, poor habits, and systemic issues within the profession. Let’s examine the most common causes.

- Ego and Overconfidence Some su

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