Global Compliance Hub Try Universal Sandbox

How the Verifier Works

The Verifier computes the Haversine great-circle distance between your original and claimed-transformed coordinate pairs. It then compares this against the expected shift range for the selected datum transformation pair, and classifies the result:

  • Acceptable —Deviation is within the expected tolerance of the transformation method
  • Suspicious —Deviation is outside expected range but below catastrophic mismatch tolerance. Manual review recommended.
  • Severe Mismatch —Deviation strongly suggests a datum confusion error (e.g., Tokyo treated as JGD2011, GDA94 treated as GDA2020). Transformation is invalid —do not use in production.
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Related Tools & Resources

Explore our full suite of coordinate transformation and compliance tools:

GIS Tools Hub Universal Sandbox (EPSG Explorer) LatLong —UTM Datum Compliance Engine
Certified Geodetic Insight
Verified against professional geodetic standards

The $50,000 Geodetic Drift Liability: NAD83 vs WGS84

Because the North American Plate moves ~2cm/year, NAD83(2011) and WGS84(G1762) currently diverge by over 2.2 meters. Using a "standard" GPS WGS84 coordinate for a high-precision NAD83 cadastral staking has triggered $50,000 Professional Liability claims for foundational rework and utility misplacement.

Risk Exposure Metric: 2.2-Meter Tectonic Drift & Epoch Accumulation
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Warning: Verify Your Calculation

Coordinate accuracy varies by device and datum. Do not use these results for legal or construction purposes without checking:

GPS Accuracy Alert

Your phone's GPS can be off by 30 meters. This can cause critical errors in your data.

Check My Accuracy

Datum Shift Risk

Using the wrong coordinate system (e.g. WGS84 vs NAD83) creates a permanent 1-meter offset.

Verify My Datum