I'm working on a Javelin type rocket launcher. Firing the rocket is a 3 step process...

1. Rocket leaves the barrel
2. 1/4 of a second later the rocket flies 200 pixels vertically into the air.
3. The rocket locks onto a target within a 1000 pixel radius, and begins it's decent =)

I have steps 1 & 3 covered, how would I go about doing step 2?

Thanks in advance!