Great app, very useful when doing last minute check before landing (once, on a no-quickload mission, I forgot the height of Eve atmosphere and set my Ap to 100km...). I think one way to improve it would be to add settings to change meters to kilometers: for stats like orbit heights, surface areas, gravitational parameter. It's not anything that is necessary, however for higher numbers 3.531e12 m3/s2 or 600,000 m it would be easier to display it as 3531 km3/s2 and 600 km. This app is a piece of great work and you should keep it up.