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Risk Classification:
The 1.8m Problem: Why Australia Has Two National Datums
The Indo-Australian plate moves at approximately 7 centimetres per year —one of the fastest-moving tectonic plates on Earth. GDA94, defined at 1994.0, diverged from global WGS84/ITRF realizations by roughly 1.7—.0 metres by the 2010s. ICSM officially quantifies the GDA94→GDA2020 shift as approximately 1.8m north-east, and mandates use of the official NTv2 grid transformation for all precision surveys.
Any GIS workflow treating GDA94 and GDA2020 as equivalent without transformation will accrue this error silently, with compounding drift relative to current WGS84 realizations.
→ Read the Full Australia Datum Authority GuideRelated Tools & Resources
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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.
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