Bob,

Looking at your diagram there are a coupe of practical notes that must be made. 
 First the distance and angle measurements must be taken from a point in the 
plane of the parabola, i.e.. under the limb.  

Question:
Looking at the illustration I see that angle 1 (a1) is in a different direction 
than are a2 and a3.  Is this accounted for in your calculations?  Need it be 
listed as an angle > 90 degrees.  In the diagram, must you be to the left of 
point d2.  How do you deal with the different points being on the opposite side 
of the person making the measurements?

Ed

"The most beautiful thing we can experience is the mysterious.  
It is the source of all true art and all science." - Albert Einstein
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