C 15 — NGS TU0589 — Waipahu, US

This triangulation station is part of the National Geodetic Survey's network of precisely positioned reference points that form the foundation of the United States' geodetic infrastructure. Located near Waipahu on the island of Oahu, Hawaii, at coordinates 21.51442° N, 158.06394° W, this trig point serves as a control station for surveys and mapping activities throughout the Hawaiian Islands region. Triangulation stations of this type were historically established to create accurate positional frameworks for large-scale surveying projects. The point's documented coordinates enable surveyors, engineers, and cartographers to conduct precise measurements and maintain spatial accuracy across multiple projects and decades. Verification and proper documentation of such reference points remain essential to geodetic practice, ensuring consistency in surveying work and supporting infrastructure development, land records management, and scientific research across Hawaii.

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