FLAG HILL RADIO TOWER — NGS TZ5036 — Saint Thomas - Saint John District, US

This triangulation station is part of the National Geodetic Survey's network, which establishes and maintains the official geodetic reference framework for the United States and its territories. Located in the Saint Thomas-Saint John District of the United States Virgin Islands at coordinates 18.32987°N, 64.91098°W, this trig point serves as a fundamental control station for horizontal positioning. Triangulation stations function as vertices in geodetic networks, enabling accurate surveying, mapping, and engineering projects across regional areas. Such points provide essential horizontal datum references that support professional surveying, nautical charting, and infrastructure development. The verification and documentation of these benchmark monuments remain critical for maintaining the integrity of the national spatial reference system and supporting cadastral accuracy in island territories where precise positioning is particularly valuable for land administration and coastal management.

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