I just put out a new beta, v3.92, that adds exactly what you were talking about... KMZ exports!
Rather than exporting User Maps from TF's user map library, you can simply export
any map to a .KMZ file (or directly to an Oregon/Colorado/Dakota unit). It's built into the Export View function, so you can do all map types in TopoFusion, including WMS servers, User Maps, Combo Maps, etc. Plus you can add your GPS data (lines/tracks) to the map, if you want.
I'd recommend keeping the "constrain proportions" box checked, and then setting the width to 1024. This way you'll get maximum quality on the GPS. TF will let you go larger, but the GPS maximum map size is 1024x1024, so it will get downsized/resampled, resulting in lower quality.
If you have a compatible unit, please let me know your experiences -- quality, calibration, speed, etc. I will have my own unit shortly to test and optimize, but am excited enough about this feature that I figured I would release now that it is ready.
Thanks. Full changes below.
3.92 - [10/22/09] (Beta)
Added .KMZ map exports, for use as custom maps on Oregon/Colorado/Dakota units
- Find in "Export View" function - able to export all map types, including
GPS track/waypoint overlays, shaded relief, etc.
- Select check box "Export KMZ to Garmin GPS" to auto start "save as"
dialog in Garmin\Custom Maps folder
- Any size map can be exported (eg for use in Google Earth), but maximum 1024 in
both directions is recommended to avoid resampling / speed issues on GPS
Fixed problem with graphics engine reinitializing after non-standard 2D exports
(problem introduced in 3.91)
Changed "no data" heart rate readings to zeros in profile tool (was 255 before)
Removed misplaced error message when canceling a "export view parameters" dialog