• Reference & Education, College
• GMP file structure
• July 1, 2026

A GMP file is a file that uses the `.gmp` extension, but the meaning of that extension depends on the software that created it. The most common meaning is a Global Mapper Package File, which is used by Global Mapper, a GIS and mapping program. In this case, a `.gmp` file is a self-contained map package that can include the …