I have a Garmin GPS10 which worked with MM under OS2007, but after upgrading to OS2008, it would not work with either MM or Map. I could pair it with the N800, and display my locaton using the Control Panel GPS app, but neither MM nor Map could get a fix (MM would flash "invalid NMEA data). I have since purchased a Globaltop G33 based on a MTK 51 channel chipset and it is fantastic. Super fast in acquisition and super sensitive. It locks on eight satellites in the bedroom with only a relatively small window (good thing too, because my wife says I'm lost in the bedroom, now maybe I can find my way around, by marking the best spots, like geocaching).