Vnav

If you are iPhone and iPad owner,you now can download Vnav for free from Apple Store. The application is supporting English language. It is a whopper, weighing in at 13206528, so make sure you have plenty of free space on your iOS device. The new Vnav app version 1.2 has been updated on 2017-03-22.
Bottom Line: For more information about Vnav check developer William Downing`s website : http://wrdaviation.com