PC MON 173+79.31 — NGS TU1720 — Kapolei, US

This triangulation station is part of the National Geodetic Survey's network, which provides the foundational control for surveying and mapping across the United States. Located near Kapolei on the island of Oahu, Hawaii, this trig point serves as a reference station for local and regional geodetic work in the Hawaiian archipelago. Triangulation stations of this type historically supported terrestrial surveys through intervisible networks of precisely positioned points. Contemporary users rely on such stations for validation of modern positioning technologies, establishing local control networks, and referencing historical survey data. The coordinates 21.37808°, -158.14174° define its horizontal position within the national geodetic reference frame. Verification and continued documentation of these control points remain valuable for surveyors, engineers, and geospatial professionals who depend on accurate reference infrastructure for their work.

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