This is the basic program to work with .GMG extension

Global Mapper

Global MapperGlobal Mapper Grid File

Global Mapper is a mapping utility that allows to edit, create and delete mapping information. This mapping tool allows many operations over different formats and layers of mapping information. It can open almost any mapping file format for modifying or simply converting it. Global Mapper runs on Windows 98/NT/2000/ME/XP (32-64 Bit) / Vista (32-64 Bit) platforms... (more)

The program works with the following extensions: opt, gms, gmc, gmg and gmp

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