Hi, here is a link to a lot of useful info for your 650, and yes you can download that program to your device;-)
Please visit: http://gpsinformation.info/penrod/oregon650/garminoregon650.html
and this site: http://support.groundspeak.com/index.php?pg=kb.page&id=532
And here is their downolad page geocaches;-)
In any case, I will stick with you until this is complete.
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Thank you and have a great day!