The method of uploading to MapSource is identical to loading to the unit.
THe files should be in either CSV or GPX format. sound (MP3) files and icons (BMP) should be in the same directory as the file. You Directory can be organized with sub-directories and they will be grouped that way as well.
Firstly update your software:
- POILoaderforMac_210.dmg POI Loader for Mac, Ver. 2.1.0 (10.77 MB) January 30, 2009
- POILoaderforWindows_253.exe POI Loader for Windows, Ver. 2.5.3 (10.10 MB) August 22, 2008
When you run POILoader, it lets you select 1. Garmin Device 2. MapSource (Advanced)or 3. Custom Folder (Advanced). You have to run POILoader seperately for each you want to sent the Custom POIs to.
I found I had to keep adding extra POIs to my Main Directory and then re-add the entire directory to the device otherwise just loading a single category overwrites the entire Custom POI directory on the device. So I have one folder I store POIs in and then categorize them how I want in it and upload as a big batch.