PUU KAILIO 7500 1969 — NGS TU1688 — Kapolei, US

This triangulation station is part of the NGS network, which establishes the fundamental geodetic framework for the continental United States and its territories. Located near Kapolei on the island of Oahu, Hawaii, at coordinates 21.41450° N, 158.13775° W, this trig point serves as a reference station for surveying and mapping operations across the Hawaiian Islands region. Triangulation stations of this type historically provided precise horizontal control by establishing intervisible networks across terrain. Modern surveyors and engineers rely on documented benchmark locations to tie local surveys to the national geodetic datum, ensuring positional accuracy for infrastructure projects, property demarcation, and geographic data collection. Verification and maintenance of such control points remain essential for preserving survey integrity and supporting long-term cadastral and engineering applications throughout Hawaii.

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