Nope.  
For me, it is a trial and error, or rather fire one rocket and adjust.  I only use it when I'm almost in town or rushing a field to grab OBJ or hangers, etc.  I've seen guys sit on top of hills from a loooooong ways out and rain in rockets onto their target, but that technique I would imagine takes a bit of time due to the constant shifting of the sight and positioning of the tubes.