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    EPSG reference

    EPSG:3368 — IGN Astro 1960 / UTM zone 29N

    IGN Astro 1960 / UTM zone 29N (EPSG:3368) — a Projected (metres) system on the a=6378249.145 datum, used in Mauritania. Parameters, proj4, WKT, accuracy ±0.1 m, plus a f…

    At a glance

    EPSG
    3368
    Name
    IGN Astro 1960 / UTM zone 29N
    Kind
    Projected (metres)
    Family
    Universal Transverse Mercator (UTM)
    Ellipsoid
    a=6378249.145
    Accuracy
    ±0.1 m (vs PROJ)
    Countries
    Mauritania
    Convert from this system now

    Area of use

    West-12.00°
    South14.75°
    East-6.00°
    North27.30°

    Projection parameters

    Projectionutm
    UTM zone29
    Semi-major axis6378249.145
    Inverse flattening293.465
    Unitsm
    proj4
    +proj=utm +zone=29 +a=6378249.145 +rf=293.465 +units=m +no_defs
    WKT (ESRI)
    PROJCS["IGN Astro 1960 / UTM zone 29N",GEOGCS["GCS_IGN Astro 1960 / UTM zone 29N",DATUM["D_Custom_6378249.145",SPHEROID["Custom_6378249.145",6378249.145,293.465]],PRIMEM["Greenwich",0],UNIT["Degree",0.0174532925199433]],PROJECTION["Transverse_Mercator"],PARAMETER["False_Easting",500000],PARAMETER["False_Northing",0],PARAMETER["Central_Meridian",-9],PARAMETER["Scale_Factor",0.9996],PARAMETER["Latitude_Of_Origin",0],UNIT["Meter",1],AUTHORITY["EPSG","3368"]]

    Sample conversion

    Centre of the area of use: WGS84 -9.00000, 21.02500 → EPSG:3368 500000.000, 2324716.545

    Values are within ±0.1 m at the test point.

    About the Universal Transverse Mercator (UTM) family

    IGN Astro 1960 / UTM zone 29N is a Universal Transverse Mercator zone — a 6°-wide belt of the worldwide UTM system, in metres, centred on a meridian carefully chosen so distortion stays low across the zone. It is the everyday working grid for GPS-derived surveying in Mauritania.

    The classic field mistake with UTM is using the wrong zone: a point one zone away is easily hundreds of kilometres off. Always confirm the zone number (and the hemisphere) before importing coordinates, and remember that UTM eastings are offset by a 500 km false easting so they never go negative.

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    FAQ

    What is EPSG:3368?
    It is the coordinate system “IGN Astro 1960 / UTM zone 29N”, a Projected (metres) system in the Universal Transverse Mercator (UTM) family, identified worldwide by the code EPSG:3368.
    What datum does it use, and how accurate is it?
    It is based on the a=6378249.145 ellipsoid with no default transform to WGS84 (ballpark). The residual at the test point is about ±0.1 m versus PROJ; for centimetre work use a geodetic adjustment service.
    Where is this system used?
    It is used in Mauritania. This page shows its area of use as a coordinate rectangle above.
    How do I convert EPSG:3368 to WGS84?
    Use the free coordinate converter above (preloaded with this system) to convert to WGS84, UTM, or any other system, within a ±0.1 m residual.

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