Thanks!
I guess where my confusion is that SubTech makes an automatic pitch controller (APC-3 and APC-4) that drives a servo to correct the pitch angle with the rear planes. You use the bow planes to change the pitch for up and down. Since the output is basically PWM and with pulsin you are measuring the pulse width then the code is very simple. Trueangle=((10*pulsewidth)+1500)/10. An up angle would be Displayangle = (TrueAngle -900)*2 while a down angle would be Displayangle = (900- Trueangle)*2. So it looks as if you could use a simple calculation to obtain the angle?