Since dist is calculated by using sqrt() it should never become negative. So
the line
> else if (dist <= -y) angle = -90.0; // against roundoff.
is probably not really needed.
That leaves the question: what happens if dist becomes zero? Apparently that
means you have hit the gs-antenna and you are sitting exactly on the
glideslope. By definition thats an angle of zero.
My suggestion is
if (dist <= y) angle = 90.0; // roundoff securitycheck
else if (dist < 1e-3) angle = 0.0; // within the gs antenna radius
else angle = asin( y / dist ) * SGD_RADIANS_TO_DEGREES;
Torsten
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