I'm sure someone on this forum will eventually confirm for a fact that the software will work on the 770. I have the N800 but the package for my software (which I got at Letstalk.com) has a label which says this:

"Navicore Personal 2007 North America DVD
sw:2007.3 map: TA2006.10
Compatible with:
Nokia N800 Internet Tablet, Nokia 770 Internet Tablet"

I also found this entry on the Navicore site FAQ:
http://www.navicoretech.com/Consumer...770/en_GB/770/

"Nokia 770: Which SW version is needed for Nokia 770 Internet Tablet before installing Navicore Personal 2007 application?
You must have Internet Tablet OS 2006 edition v. 2.2006.39-14 or newer. For Nokia 770 SW update, please visit www.nokia.com/770/support -> SW upgrade."

I don't blame you for wanting confirmation from a 770 user - I would want the same!