30188 — NGS TU1679 — Waipahu, US

This trigonometric station is part of the National Geodetic Survey's network of precisely positioned control points that form the backbone of the United States' geodetic infrastructure. Located near Waipahu on the island of Oahu, Hawaii, at coordinates 21.31459° N, 157.99874° W, this trig point serves as a fundamental reference for surveying, mapping, and engineering activities throughout the region. With an ellipsoidal elevation of 17.5 meters, the point provides vertical control essential for accurate positioning work. Trigonometric stations of this type have historically supported large-scale surveys and continue to serve modern positioning needs. Verification and documentation of such benchmarks remain valuable for maintaining survey accuracy, validating contemporary positioning systems, and ensuring the integrity of cadastral and infrastructure records. Professional surveyors rely on established control networks to tie local surveys to the national datum.

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