App that works like a VOR? (Flying thing)

[meatcookie]

It's a tool that locks on to a transmitter on the ground when you're flying, and you select which bearing you want to approach or depart from, and a little needle tells you if you're right or left of you're intended line of travel. I'd want the ability to just enter coordinates or click a map, and let gps guide me to stay on track...everything I've played with simply updates which direction and distance I need to go, but doesn't tell me (or ring in my ear) "Hey dumbass! You're off course!)

Ideas?