I have read the Wikipedia entry on making a gravitational maneuver in KSP, however I fail to see it's effect. I get my rocket to 100 m/s, switch to orbit on top of the Navball and start turning the rocket left, towards prograde. Strangely - the prograde marker is way to the left when I start the maneuver, while the Wiki states entry that the gravitational maneuver should be done by small adjustments all the way up, not just one single turn to the horizon. And after that I fail to see any big improvement in height reached when compared with a strictly vertical flight. Maybe I am missing something here?