Here's something that I'm sure others have run into as well: you pick a mission that takes you to a moon surface, then fly your ship to near the moon until you can see the waypoint marker. You then fly yourself down to the surface, keeping an eye on the distance to the spot. The ground looks close, but the distance is still a few Km, so it's probably just not being able to judge altitude by eyeball. Wrong! you bounce off the ground, and see that there is nothing nearby and the marker's distance is still kilometers away. So you take off, fly in a straight line following the moon's curvature towards the marker, until you can see the outpost and land next to it. What happened? simple: the current system treats planetary bodies as if they were just the abstract surfaces of spheres, rather than solids that you can't simply fly through. So it just showed you the shortest, straight line path to the point of interest and ignored the fact that you need to fly over the horizon for a bit before you can actually descend to it. A very simple way of doing that would be to note that the surface point of interest is obscured, similarly to space ones when a planetary body is in the way. If you see that, then you know that you need to fly forwards for a bit before you can make your final approach.