How would you create a lock-on missile?

Currently, I am wanting a cannon that you can be sitting inside of the ship, and the cannon be on the outside, but you can still control it from the inside of the boat. Now, I also want it so that it will lock-on to players when they are aimed at.

Now, I have a cannon that you sit in and it turns and shoots like a cannon would.

I also have the ROBLOX LockonLauncher (the gear) that locks onto player targets.

How would you combine these so that you can shoot the rocket from the Gear just as you would the cannon? Like, the launcher shoots a rocket from the handle, but how would you change the location where it shoots from??

If this doesn't make sense, let me know.