Lambert 72 / Lambert 2008 ↔ WGS84

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WGS84 (GPS)LatitudeLongitude

Lambert 72 · EPSG:31370X (m)Y (m)

Lambert 2008 · EPSG:3812X (m)Y (m)

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Belgian coordinate systems

Lambert 72 (Belgian Lambert 1972, EPSG:31370) — metres, on the Belgian Datum 1972 (Hayford ellipsoid). Still the most common system in Flemish and federal GIS data, cadastral plans and the address registers (CRAB/Adressenregister positions).
Lambert 2008 (EPSG:3812) — the newer system on ETRS89, used by NGI/IGN. Its numbers differ from Lambert 72 by roughly 500 km in X and Y, so they're easy to tell apart.
WGS84 — GPS latitude/longitude as used by web maps.

Datum conversion uses the standard 7-parameter Helmert transformation (EPSG:15929 for BD72 → WGS84), accurate to about 1 metre — fine for mapping and geocoding, not for surveying. For centimetre accuracy use the NGI's official grid-based transformations.