The fact that you want to know where something is without being able to see it is more than enough to answer your question. F3 is a major cheat mode. Just look at any of the TA furball buddies that only know how to fight in F3. It gives you so much more SA and even related to your position above the ground, against targets, or dodging incoming attacks you have no business seeing.
There's nothing legit about it. You don't like it, take a different plane, get some air cover, a wingman, a friend, or fly a Hurr2D or a Stuka (better guns I believe?).
No offense, but it's not a good request IMO.