5 7 — NGS TU0501 — Honolulu County, US

This triangulation station is part of the National Geodetic Survey's network of control points that form the foundation of the United States' horizontal geodetic datum. Triangulation stations serve as primary reference points for surveying, mapping, and engineering projects throughout their region. Located in Honolulu County, Hawaii, this benchmark contributes to the geodetic control network covering the Hawaiian Islands. The coordinates 21.65687°N, 157.93086°W establish its precise horizontal position for reference by surveyors and cartographers. As a trig station, it was historically observed as part of triangulation chains connecting multiple control points. Verification and documentation of such monuments remain essential for maintaining the integrity of the national spatial reference framework and ensuring the accuracy of all derivative surveys and mapping efforts in the area.

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