HO 9 — NGS TU0673 — Waipahu, US

This triangulation station represents part of the National Geodetic Survey's foundational control network across the United States. Located near Waipahu on the island of Oahu, Hawaii, at coordinates 21.34083°N, 158.01472°W, this trig point serves as a reference station for horizontal geodetic control. Triangulation stations of this classification establish precise horizontal positions used for mapping, surveying, and engineering projects throughout their respective regions. The NGS network provides essential datum references for both public and private surveying activities. Documentation and verification of such benchmarks remain important for maintaining the integrity of the national spatial reference system, particularly in areas where historic monuments may be affected by development or environmental conditions. Field surveyors rely on accurate positioning data from these control points to establish local surveys with confidence.

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