When you are the sole user of the Oudie it is better to place XCsoar on the Oudie instead of an sd-card. When you start the Oudie from the sd card and you close off the program the Oudie remains in a dormant mode after pressing the on/off key of the Oudie. For it to switch off completely you will need to restart the CU program until the shell appears and then press the on/off key. The oudie then will ask if you want to switch off completely. Since my partner uses CU and I use XCsoar this is the way for me to shut off the Oudie completely (so close off XCSoar, press the reset button at the back, wait for CU to emerge, press the off button on CU and then press the off button on the Oudie. I have consulted the guys and they have confirmed in case of a dual mode there is no other way.