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http://cgpsmapper.com/buy.htm

sendMap

Free sendMap20 rev 4.0 for Windows

Software for uploading maps to your GPS. It now uses the official Garmin USB driver. Before using, you should install the USB driver for your GPS. If your GPS is RS based only, you don't have to install this USB driver. The RS interface will work fine. You can download the USB driver from Garmin's site.
To see how to use it - start it without '-h'
New features

Store a file list on disk (TXT file) that can be used later with '-f' option
Read file list (just drag and drop TXT file)
Support up to 1GB
Check for available memory in GPS - now sendmap will not start the upload process if there is not enough memory
Ability to change the 'region name' for every file
Support for uploading several TYP files (customization of built in types) - TYP files are used on maps with the same region name
Fixed uploading of several unlock keys
Fixed saving to text file TYP and MDR files (filelist)

Recent fixes

Create an EXE with TYP files included
Fixes issues with mapset names