CHI-LOCK — NGS DS3959 — Chicago, US
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CHI-LOCK — NGS DS3959 — Chicago, US is a triangulation station located in United States, catalogued in the US NGS dataset. The point has been assigned the stable identifier #215104 on SurveyingPedia and sits at an approximate elevation of 178.7 metres. Its coordinates in WGS84 are 41.888554°, -87.606889°, corresponding to 41° 53′ 18.79″ N, 87° 36′ 24.80″ W in the traditional degrees-minutes-seconds format. This page is a self-updating reference — all data is aggregated from public open sources and cross-checked periodically against the originating agency.
Professional surveyors, engineers, and topographers use points like CHI-LOCK — NGS DS3959 — Chicago, US to anchor total-station traverses, verify GNSS/RTK solutions, calibrate levelling instruments, and validate survey deliverables against known coordinates. The record on this page is refreshed daily via automated pipelines that monitor the public sources for any updates, corrections, or status changes.
Coordinate formats
| WGS84 (decimal) | 41.888554, -87.606889 |
| WGS84 (DMS) | 41° 53′ 18.79″ N, 87° 36′ 24.80″ W |
| UTM zone (approx.) | Zone 16N (approx.) |
| Elevation | 178.67 m |
| Precise conversion | Open in coordinate converter → |
Geodetic context in United States
The national geodetic reference in United States is maintained by National Geodetic Survey (NGS). The active datum is NAD83(2011) / NATRF2022 (active). Coordinates shown on this page are expressed in WGS84 (ETRF/ITRF-compatible) which is directly usable in most modern GNSS receivers. For cadastral work in United States you may need to convert to the local datum using the Coordinate Hub.
Browse the full list of indexed control points in United States from the country page.
Nearby benchmarks
The closest 6 indexed control points within roughly 50 km of this location:
Frequently asked questions
What is CHI-LOCK — NGS DS3959 — Chicago, US?
CHI-LOCK — NGS DS3959 — Chicago, US is a triangulation station located in United States, catalogued in the US NGS network. It has the public identifier #215104 and sits at an elevation of 178.7 metres. The point is used for geodetic reference, topographic surveys, and related measurement workflows.
Where are the exact coordinates of CHI-LOCK — NGS DS3959 — Chicago, US?
The position of CHI-LOCK — NGS DS3959 — Chicago, US in WGS84 is 41.888554°, -87.606889° (decimal), or 41° 53′ 18.79″ N, 87° 36′ 24.80″ W in degrees-minutes-seconds. For planar surveys in United States this falls approximately in UTM Zone 16N (approx.).
How can I reach and visit this triangulation station?
Use the satellite imagery above to see the surrounding area. You can open this location directly in Google Maps, Google Earth, Bing Maps, or OpenStreetMap using the buttons provided. Many geodetic points are accessible to the public; some are on protected or private land — check local regulations before any field visit. Always bring documentation or your credentials if you plan to use the marker for professional measurement.
Is this point verified and usable for professional surveying?
This record has been community-verified 0 times. Data quality depends on the source: NGS and official national agency points are typically centimetre-accurate, OpenStreetMap survey points are metre-accurate, and GeoNames topographic landmarks (peaks, hills) are reference-grade only. Always cross-reference with the original agency datasheet before using this point for cadastral, legal, or safety-critical work.