NANAKULI — NGS TU1690 — Kapolei, US

This triangulation station is part of the National Geodetic Survey's network, which establishes the fundamental horizontal and vertical control framework for the United States. Located near Kapolei on the island of Oahu, Hawaii, at coordinates 21.38890°N, 158.14241°W, this trig point serves as a reference station for surveying and mapping activities throughout the region. Triangulation stations of this type historically provided precise positioning data essential for large-scale surveys, property demarcation, and infrastructure development. Modern surveyors and GIS professionals rely on documented benchmark locations to validate contemporary positioning systems and maintain spatial data accuracy. The documented existence and recovery of such control points remain valuable for quality assurance in surveying work and for understanding the historical development of Hawaii's geodetic infrastructure. Verification and maintenance of these reference monuments support continued surveying precision across the islands.

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