HCTC 9 — NGS DR2085 — Waipahu, US

This triangulation station is part of the National Geodetic Survey network, which establishes the fundamental horizontal and vertical control for the United States. Trig stations serve as primary reference points for surveying, mapping, and engineering projects across the nation. Located near Waipahu on the island of Oahu, Hawaii, this benchmark contributes to the geodetic framework for the Hawaiian Islands. The coordinates 21.37423°, -158.04123° define its precise horizontal position within the NGS database. As a trig point, it historically supported triangulation methods used to develop accurate large-scale surveys and maps. Verification and proper documentation of such control points remain valuable for surveyors and engineers undertaking projects requiring high positional accuracy. Modern users may reference this station to validate contemporary survey networks or establish local control for construction and infrastructure work.

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