What is a GMP file?
The .GMP file extension is used by several different software applications, mostly for maps and spatial data. Most commonly, it is a Global Mapper Package File created by Blue Marble Geographics. These files store geospatial raster and vector data. Alternatively, a .GMP file can be a Garmin Map Package file used by GPS devices, a game map for Unreal Engine, or an XML/JSON-based map file for GMapGIS.
How to open GMP files?
Because .GMP files have multiple possible meanings, you must know the source software to open them correctly. Geospatial .GMP files require Global Mapper or Garmin MapSource. Game maps require the Epic Games Unreal Engine or specific titles like Railroad Tycoon II. Other obscure uses include DVR backup files by GeoVision or gaming mouse profiles by A4Tech.
Best practices and troubleshooting
If you do not know the origin of your file, viewer.online/gmp can analyze .GMP files to identify the exact format and creator software. You can use our tool to inspect the file structure, extract readable text, and check whether an online preview is available.
If you have a GIS-based .GMP file, you might need it in a more common format. We recommend using convert.guru to convert geospatial data into widely supported target formats like .KML, .SHP, or .GEOJSON.
Summary
viewer.online/gmp is incredibly useful for identifying, inspecting, and understanding .GMP files without installing heavy desktop GIS software or dealing with format compatibility problems.