PUU KAILIO 1000 1969 — NGS TU1685 — Kapolei, US

This trigonometric station is part of the National Geodetic Survey's network of control points that establish the horizontal and vertical reference framework for the United States. Located near Kapolei on the island of Oahu, Hawaii, at coordinates 21.46086° N, 158.13009° W, this trig point serves as a fundamental reference for surveying, mapping, and engineering projects throughout the Hawaiian Islands and surrounding regions. Trig stations such as this are monumented points of known and precisely determined position, traditionally used to extend geodetic control and support downstream surveying work. The NGS network remains critical infrastructure for cadastral surveys, infrastructure development, and scientific applications requiring accurate spatial reference. Verification and documentation of such points ensures continuity of the geodetic datum and maintains the integrity of positional data for current and future surveying operations.

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