• Unspecified datum based upon the International 1924 Authalic Sphere

  EPSG:4053
  Area of use: Not specified.
  Transform coordinates | Get position on a map

• Unspecified datum based upon the Hughes 1980 ellipsoid

  EPSG:4054
  Area of use: Not specified.
  Transform coordinates | Get position on a map

• NAD27 for shapefiles w/o a PRJ

  ESRI:104000
  Area of use: Not specified
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• International 1967

  ESRI:104023
  Area of use: Not specified
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• EPSG seismic bin grid example A

  EPSG:5804
  Area of use: Not specified.
  Transform coordinates | Get position on a map

• EPSG seismic bin grid example B

  EPSG:5805
  Area of use: Not specified.
  Transform coordinates | Get position on a map

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Type of results

• Coordinate reference systems (47)

•    Geodetic (45)
•    Engineering (2)

• Operation (5)

•    Transformation (2)
•    Conversion (3)

• Datum (46)

•    Engineering (4)
•    Geodetic (42)

• Area (1)