RELAY — NGS TU1639 — Kapolei, US

This triangulation station is part of the National Geodetic Survey's network of reference points that establish the geometric framework for surveying and mapping throughout the United States. Situated near Kapolei on the island of Oahu, Hawaii, at coordinates 21.39549° N, 158.10213° W, this trig point contributes to the geodetic control infrastructure essential for accurate positioning and land surveying across the Hawaiian islands. Trigonometric stations such as this historically served as primary control points for surveying networks, enabling surveyors to establish precise horizontal positions for subsequent mapping and engineering projects. Modern surveying professionals continue to utilize these established reference points for verification of contemporary positioning data and as validation markers for GPS and other survey methods. Documentation and verification of such benchmark locations remains valuable for maintaining institutional geodetic records and ensuring continuity in spatial reference systems.

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