Whether in the restaurant, shopping or bus and train: almost everywhere you have to carry your vaccination certificate and show. Probably the easiest way is the digital detection, which many save in the Compass app. And at the latest since the Corona warning app can also read codes of the Luca app, it is the better choice when checking in for events and Co. But both in the Compass and in the Corona warning app have a few practical addition Features hiding, many do not even know. Below we show you the best tips and tricks for both applications. Tips and tricks for the corona warning app