如何在另一个节点的方向上移动节点

I found the this answer on Stack overflow, but I want to make a modification to it that I just can't figure out. The answer to that question shows how to make the missile move in the direction of your finger. However, I want it to move in the direction of another node (in my case a ship) Meaning that instead of following my finger, it follows the ship. How can a achieve this? answer on Stack overflow, but