Auto switching from gps to VLOC when the glide slope is captured is a standard feature of the gns 430 and 530 as long as it is enabled in the menus of the unit and the ils frequency is set in active window. I can get it to work with the centurion using reality XP hsi but can not get it to work with any other plane with the exact same settings used. I’m just trying to figure out if anyone else has this problem.