Img2gps will support you in tranfering any map file to Garmin GPS.
A Windows GUI for the SendMap / Sendmap20 DOS application by gps mapper. It will transfer any Map file (.img format) to your Garmin GPS and also works on with garmin maps.
Features:
compatibility of .GDB files made from maps downloaded from MapCenter.
support for .TYP files
option to copy maps to a memory card or folder
option to create file instead of upload
support for Mapset name
support for more COM ports