It is hard to do without spin, I've never succeed, but you
may try this :

Code:

---

while(my)
{
   vec_diff(temp,targetA.x,my.x);
   temp.tilt %= 90; // play with 90
   vec_to_angle(my.pan,temp);
	
   wait(1);
}

---

It still spin but smoothly. If you want to track a taget with
arbitrary angle, you can try the example "chase camera" code
from the manual->ang_add/anng_rotate.