Coordinate systems
Every grid GIMLabs supports, with its EPSG code and how exactly it converts to latitude and longitude.
This is the full list of grids a project or configuration can use. For how a project picks its grid and how locations are read and placed in it, see Locations and site plans.
Supported grids
Search the coordinate system picker by any of these: the country, the grid's
name or its EPSG code (with or without EPSG:). A grid shared by two
countries, such as LV95 in Switzerland and Liechtenstein, is listed under both.
| Country | Grid | EPSG code | Conversion to latitude/longitude |
|---|---|---|---|
| Worldwide | WGS84 (latitude/longitude) | EPSG:4326 | Exact |
| United Kingdom (Great Britain) | OSGB36 (British National Grid) | EPSG:27700 | About 2 m (datum shift, not OSTN15) |
| Austria | MGI / Austria GK West | EPSG:31254 | About 1 m (datum shift) |
| Austria | MGI / Austria GK Central | EPSG:31255 | About 1 m (datum shift) |
| Austria | MGI / Austria GK East | EPSG:31256 | About 1 m (datum shift) |
| Belgium | Lambert 2008 | EPSG:3812 | Exact (ETRS89) |
| Belgium | Lambert 72 | EPSG:31370 | About 1 m (datum shift) |
| Croatia | HTRS96/TM | EPSG:3765 | Exact (ETRS89) |
| Czechia | S-JTSK / Krovak East North | EPSG:5514 | About 1 m (datum shift) |
| Estonia | L-EST97 | EPSG:3301 | Exact (ETRS89) |
| Finland | ETRS-TM35FIN | EPSG:3067 | Exact (ETRS89) |
| France | Lambert-93 | EPSG:2154 | Exact (ETRS89) |
| Greece | GGRS87 / Greek Grid | EPSG:2100 | About 1 m (datum shift) |
| Hungary | EOV | EPSG:23700 | About 1 m (datum shift) |
| Ireland | ITM | EPSG:2157 | Exact (ETRS89) |
| Ireland | Irish Grid (TM75) | EPSG:29903 | About 1 m (datum shift) |
| Latvia | LKS-92 | EPSG:3059 | Exact (ETRS89) |
| Liechtenstein | LV95 | EPSG:2056 | About 1 m (datum shift) |
| Lithuania | LKS-94 | EPSG:3346 | Exact (ETRS89) |
| Netherlands | RD New | EPSG:28992 | About 1 m (datum shift) |
| Poland | PL-1992 | EPSG:2180 | Exact (ETRS89) |
| Portugal | PT-TM06 | EPSG:3763 | Exact (ETRS89) |
| Romania | Stereo70 | EPSG:3844 | About 1 m (datum shift) |
| Slovakia | S-JTSK / Krovak East North | EPSG:5514 | About 1 m (datum shift) |
| Slovenia | D96/TM | EPSG:3794 | Exact (ETRS89) |
| Slovenia | D48/GK | EPSG:3912 | About 1 m (datum shift) |
| Sweden | SWEREF99 TM | EPSG:3006 | Exact (ETRS89) |
| Switzerland | LV95 | EPSG:2056 | About 1 m (datum shift) |
| United Kingdom (Northern Ireland) | ITM | EPSG:2157 | Exact (ETRS89) |
| United Kingdom (Northern Ireland) | Irish Grid (TM75) | EPSG:29903 | About 1 m (datum shift) |
| Europe-wide | ETRS89 / UTM 28N | EPSG:25828 | Exact (ETRS89) |
| Europe-wide | ETRS89 / UTM 29N | EPSG:25829 | Exact (ETRS89) |
| Europe-wide | ETRS89 / UTM 30N | EPSG:25830 | Exact (ETRS89) |
| Europe-wide | ETRS89 / UTM 31N | EPSG:25831 | Exact (ETRS89) |
| Europe-wide | ETRS89 / UTM 32N | EPSG:25832 | Exact (ETRS89) |
| Europe-wide | ETRS89 / UTM 33N | EPSG:25833 | Exact (ETRS89) |
| Europe-wide | ETRS89 / UTM 34N | EPSG:25834 | Exact (ETRS89) |
| Europe-wide | ETRS89 / UTM 35N | EPSG:25835 | Exact (ETRS89) |
| Europe-wide | ETRS89 / UTM 36N | EPSG:25836 | Exact (ETRS89) |
| Europe-wide | ETRS89 / UTM 37N | EPSG:25837 | Exact (ETRS89) |
| Europe-wide | ETRS89 / UTM 38N | EPSG:25838 | Exact (ETRS89) |
What the conversion column means
- Exact (ETRS89): the grid is on ETRS89 or a national realisation of it, so GIMLabs converts to latitude and longitude with no datum shift.
- About 1 m (datum shift): the grid is on an older national datum, such as D48 (MGI 1901), MGI, S-JTSK, Amersfoort or CH1903+. GIMLabs uses the datum shift published in the EPSG database, which is good to about a metre against EPSG's best transformation. That is plenty for plotting holes on the map, but it is not a survey-grade conversion: national grid-shift files (NTv2) are not used.
- British National Grid uses the published Helmert shift rather than OSTN15, good to about 2 m.
Eastings and northings you enter or import are stored as written; the conversion only affects where a location is drawn on the map and the latitude and longitude shown beside it.
Which grid to choose
- Use the grid your survey data is delivered in. Two grids for the same country, such as D96/TM and D48/GK in Slovenia or ITM and the Irish Grid in Ireland, give different numbers for the same point, so a file in the other one lands hundreds of metres out.
- Where a country has no national grid listed, use the ETRS89 / UTM zone for its longitude. Each zone covers 6 degrees: zone 31N is 0° to 6°E, 32N is 6°E to 12°E, 33N is 12°E to 18°E, and so on.
- If your organisation has a country set in Product OS, the picker suggests that country's national grid for new configurations and projects.
Czechia and Slovakia
S-JTSK / Krovak East North (EPSG:5514) gives negative eastings and northings, for example about E -742 806, N -1 043 010 in central Prague. Enter them with the minus sign.
Last updated 16 October 2026