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    EPSG reference

    EPSG:3440 — PSD93 / UTM zone 40N

    PSD93 / UTM zone 40N (EPSG:3440) — a Projected (metres) system on the a=6378249.145 datum, used in Oman. Parameters, proj4, WKT, accuracy ±0.1 m, plus a free converter t…

    At a glance

    EPSG
    3440
    Name
    PSD93 / UTM zone 40N
    Kind
    Projected (metres)
    Family
    Universal Transverse Mercator (UTM)
    Ellipsoid
    a=6378249.145
    Accuracy
    ±0.1 m (vs PROJ)
    Countries
    Oman
    Convert from this system now

    Area of use

    West54.00°
    South16.89°
    East59.91°
    North26.58°

    Projection parameters

    Projectionutm
    UTM zone40
    Semi-major axis6378249.145
    Inverse flattening293.465
    Unitsm
    Helmert shift to WGS84-180.624,-225.516,173.919,-0.81,-1.898,8.336,16.71006
    proj4
    +proj=utm +zone=40 +a=6378249.145 +rf=293.465 +units=m +no_defs +towgs84=-180.624,-225.516,173.919,-0.81,-1.898,8.336,16.71006
    WKT (ESRI)
    PROJCS["PSD93 / UTM zone 40N",GEOGCS["GCS_PSD93 / UTM zone 40N",DATUM["D_Custom_6378249.145",SPHEROID["Custom_6378249.145",6378249.145,293.465],TOWGS84[-180.624,-225.516,173.919,-0.81,-1.898,8.336,16.71006]],PRIMEM["Greenwich",0],UNIT["Degree",0.0174532925199433]],PROJECTION["Transverse_Mercator"],PARAMETER["False_Easting",500000],PARAMETER["False_Northing",0],PARAMETER["Central_Meridian",57],PARAMETER["Scale_Factor",0.9996],PARAMETER["Latitude_Of_Origin",0],UNIT["Meter",1],AUTHORITY["EPSG","3440"]]

    Sample conversion

    Oman capital: WGS84 58.59220, 23.61390 → EPSG:3440 662144.692, 2612137.276

    Values are within ±0.1 m at the test point.

    About the Universal Transverse Mercator (UTM) family

    PSD93 / UTM zone 40N 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 Oman.

    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.

    Related systems

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    FAQ

    What is EPSG:3440?
    It is the coordinate system “PSD93 / UTM zone 40N”, a Projected (metres) system in the Universal Transverse Mercator (UTM) family, identified worldwide by the code EPSG:3440.
    What datum does it use, and how accurate is it?
    It is based on the a=6378249.145 ellipsoid and it carries Helmert parameters to WGS84. 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 Oman. This page shows its area of use as a coordinate rectangle above.
    How do I convert EPSG:3440 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.

    You may also need: Arab-world coordinate converter · Surveying file format converter · Batch coordinate file converter