H 245 — NGS TU0580 — Waipahu, US

This trigonometric station is part of the National Geodetic Survey's fundamental control network, which establishes the geometric framework for surveying and mapping throughout the United States. Located near Waipahu on the island of Oahu, Hawaii, at coordinates 21.51203° N, 158.04228° W, this trig point serves as a reference station for local and regional geodetic work. Trigonometric stations of this type traditionally functioned as primary control points for triangulation networks, enabling surveyors to establish accurate horizontal positions for subsequent surveys. The point's location in Hawaii reflects the NGS commitment to extending precise geodetic control across all U.S. territories and possessions. Verification and documentation of such benchmark stations remain essential for maintaining the integrity of the geodetic datum and supporting contemporary surveying operations, including GPS calibration and validation efforts. Surveyors should consult current NGS databases to confirm the mark's condition and accessibility before field operations.

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