You can't accidentally move the track or the plane on SkyDemon when in navigation mode
You can. I just did a few seconds ago. I have pre-loaded route and with a swipe of a finger I was able to move one of my legs to a waypoint wherever I want to (or didnt want to as the case may be). Unlike the planning screen, you cant 'Undo' it.
I'm not saying it's not a useful feature if you plan to divert or change a planned leg in the air, but some kind of lock feature would be useful to prevent this kind of thing happening unplanned on SkyDemon, or any of the iPad based GPS apps.