.GMG

.GMG file extension

This is the basic program to work with .GMG extension

Global Mapper

Global MapperGlobal Mapper Grid File

Global Mapper is an easy-to-use spatial data management tool for GIS mapping. It lets you import and export data from your spatial databases in over 250 different spatial data formats including Esri ArcSDE, MySQL Spatial, Oracle Spatial, PostGIS/PostgreSQL, etc... (more)

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