Various GPS maps / navigation files can be usually converted between each other, provided they are not in some unique closed format. Programs like GPSBabel or similar support many of these formats and thus should be able to help you with the KML to GDB conversion.
Convert Google Earth Keyhole Markup language file to Garmin MapSource GPS waypoint database.
We found 4 software records in the database related to .kml to .gdb file format conversion.
Microsoft Windows software - convert kml to gdb on Windows
A program for conversion of various waypoint and GPS map formats
Convert from kml file format
|Yes, GPSBabel supports kml file conversion as a source file type.||No||No||No||No||No||No||No|
|Yes, GPSBabel supports gdb file conversion as a target file type.||No||No||No||No||No||No||No|
The tables with software actions are a good pointer for what a certain program does with various file types and often may give users a good hint how to perform certain file conversion, for example the above-mentioned kml to gdb. However, it is not perfect and sometimes can show results which are not really usable because of how certain programs work with files and the possible conversion is thus actually not possible at all.
Apple macOS / Mac OS X software - convert kml to gdb on OS X
Application that allows users to convert waypoints and GPS map formats.
Linux/Unix software - convert kml to gdb on Linux
Program for Linux that allows users to covnert waypoints, tracks, and routes between popular GPS receivers.
On-line services software - convert kml to gdb on web
A GPS mapping tool