Garmin map
File type: GIS, GPS navigation and map file
A gmap file extension identifies Garmin map data used with Garmin GPS navigation devices, navigation applications for Windows and Mac, and Garmin desktop mapping software.
The data is used in Garmin BaseCamp rather than being a document intended for editing in a general-purpose application.
File type category:
GIS, GPS navigation and map file
Date updated: October 6, 2026
The gmap file extension is associated with map data supplied by Garmin for its GPS navigation products, navigation applications for Windows and Mac, and desktop mapping software.
A gmap file contains map data and supporting files that Garmin software uses to display roads, places and other geographic information. It is commonly handled as a map package or folder, so its internal files should remain together.
On Windows, Garmin BaseCamp uses installed Garmin map data for planning and viewing routes and for working with compatible Garmin navigation devices. The format is specific to Garmin software and is not intended as a general-purpose GIS exchange format.
Use Garmin BaseCamp on Windows to use a .gmap file. If the file is supplied as a folder, keep the folder structure intact and install or import the map package as directed by Garmin; opening an individual file from inside the package may not work.
Use Garmin BaseCamp or other compatible Garmin software to work with the map or transfer it to a compatible Garmin device instead of converting the package to a general-purpose map format.
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