Added button lock after wakeup in surface mode: During setup of diveequipment the OSTC4 is sometimes operated unintended (e.g. while equipping the jaket). To avoid this it is now possible to activate a button lock in the button lock sensitivity menu. The OSTC4 will then wakeup as usuall but if the diver wants to oerate the menus he has to press the buttons in a certain order. The button to be pressed is indicated by a blue bar. The button lock is deactivated in dive mode.