D Minder Pro funktioniert nicht

You setup basic information one time, like your height and weight and skin type and then any time you are outside, during the prescribed hours (and parts of the year), you can have it compute the amount of D you are getting in a stopwatch interface.  The idea behind this application is that it will help you track and manage your Vitamin D.  Each day, you can see forecasts based on your location, and you can also see the solar position, your generated vitamin D vs. target etc.  The application will notify you with the next opportunity to generate vitamin D.  It will also track how long you can stay out and warn you when the time is up.  In the Pro version, you can see your exposures' history and you will be able to schedule future events for next exposures.