After I downloaded the 845 map, which seems to be working OK, I found that the window that displays the number of Map Share corrections now indicates that my maps are over 20 weeks old & that Map Share is not working at this time. Previously, this window functioned correctly. I'm using Win 7, TTHome 2.7.3.1894& application 8.351. Never had a problem with this Go 630 until now. Any suggestions?