Please create the ability to fully open and close the DD app on mobile device (iPad) while in the field, without internet connectivity; such that the app doesn't "lock up" becuase it is no longer in any WiFi range. By "in the field" I mean very remote locations without cellular or wifi internet service of any kind.
If one loses power to the tablet or inadvertently turns the tablet off to conserve power while on multi-day (and multi-month trips!) you cannot open the app up again. And by default you cannot fly DD planned missions until you get back to an internet connection; so all that planning, preparation, travel and opportunity costs are lost.
Simply make it possible to open the app without having to "log in" with internet connectivity. It could be part of the paid subscription options not available to free users, if that helps. As it stands I have cancelled my subscription because of this achilles heel in the app design.
At the very least, make it known to your users that this is the case with the app. A lot of the world has slow, or no internet.
Otherwise, keep up the good work in designing and maintaining a valuable service!