I am now using 8.5.0 along with Xubuntu 14.04 and Crossover beta 15.0. All works fine. GSAK is still a little bugg but as soon as you discover the few things that causes a crash it is easy to avoid them. I still do not connect directly with the GPS due to other issues, but new gps'es usually appear as a disk drive so downloading geocaches is no problem at all. With older geocache you will need a workaround.