This application is to assist you in your pre flight planning. You can get an estimate of what you useful load ,and how you should load it. This will make it easier for you when you do your preflight W&B calculation. To change your empty weight and empty moment just click the dark area at the top and a keyboard will appear to change what you selected.
If you experience any malfunction or find any bugs please let us know ASAP so we can send Apple an update.