PBNYC,
Mapsource is not great for this type of data, and I don't see a way to import your UTM coords. I build and import/export files all the time for projects using survey software, but I also use expertGPS; for which I have paid the $60 dollars for. You can try easyGPS forever or download expertGPS for 30 days free. ExpertGPS will definitely bring in your excell data and then can be exported directly to your Garmin.
If you need help, I would be glad to help you.
CallawayMT
There are a couple ways to format and convert between different gps formats in excel... I have some macro'ed the others are procedures to follow... throw me an example... contact me directly. thanks.
