Interactive table detailing the physical offset in meters when transforming between legacy national datums and global WGS84/ITRF standards.
| Source Datum | Target Datum | Approximate Shift | Severity & Industry Impact | Recommended Tool |
|---|---|---|---|---|
| NAD27 (USA) | NAD83(2011) | 10 - 100+ meters | Catastrophic (Oil &
Gas) Subsurface trespass limit |
NADCON 5 |
| NAD83(1986) / (2011) | WGS84 (ITRF) | 1.0 - 2.0 meters | High Risk
(Construction) Boundary scale & stakeout error |
HTDP / NADCON5 |
| NGVD 29 | NAVD 88 (Vertical) | -0.5 to +1.5 meters | High Risk (FEMA/Flood) Flood insurance compliance failure |
VERTCON 3.0 |
| OSGB36 (UK) | WGS84 | 100 - 120 meters | Catastrophic
(Utility/Civil) Underground asset mislocation |
OSTN15 Grid |
| GDA94 (Australia) | GDA2020 | 1.8 meters | High Risk (Precision
Ag) Autonomous path deviation |
GDA NTv2 Grid |
| Tokyo Datum | JGD2011 | 400+ meters | Massive Offset (Real
Estate) Total legal boundary loss |
GSI jgdtrans / EPSG:6714 |
| DHDN (Germany) | ETRS89 | 100 - 150 meters | Catastrophic (Telecom) Fiber network misalignment |
BETA2007 NTv2 Grid |
| NAD83(CSRS) Canada | WGS84 | ~1.5 meters | High Risk
(Forestry/Mining) Lease boundary operational trespass |
NTV2_0.gsb |
| NZGD49 | NZGD2000 | 200 meters | Catastrophic
(Cadastral) Subdivision plot offset |
LINZ transformation grid |
| ED50 (Europe) | WGS84 | 100 - 150 meters | Catastrophic (Offshore) Platform positioning & rig spacing error |
Country-specific NTv2 |
| SAD69 (South America) | SIRGAS2000 | 60 - 70 meters | Catastrophic
(Mapping) Topographic scale distortion |
ProGriD |
| Amersfoort (NL) | ETRS89 | 100 - 120 meters | Catastrophic
(Waterways) Dike/flood defense risk limits |
RDNAPTRANS |
Using the wrong datum or applying coordinates without grid-to-ground correction can cause 1-400 metre positional errors —a leading cause of surveying negligence claims and contract disputes.
Explore our full suite of coordinate transformation and compliance tools:
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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