From 0ec4bf22bf75159cf9d183788d0a3d58e07b91f3 Mon Sep 17 00:00:00 2001
From: mfranz <mfranz>
Date: Thu, 2 Apr 2009 18:14:50 +0000
Subject: [PATCH] Ron JENSEN: fix division by zero problem (asin -> atan2;
 navradio.cxx)

---
 src/Instrumentation/navradio.cxx | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/Instrumentation/navradio.cxx b/src/Instrumentation/navradio.cxx
index b4455be10..4553744d7 100644
--- a/src/Instrumentation/navradio.cxx
+++ b/src/Instrumentation/navradio.cxx
@@ -607,10 +607,10 @@ FGNavRadio::update(double dt)
                 // FIXME/FINISHME, what should be set here?
             } else if ( inrange ) {
                 double x = gs_dist_node->getDoubleValue();
-                double y = (fgGetDouble("/position/altitude-ft") - nav_elev)
+                double y = (alt_node->getDoubleValue() - nav_elev)
                     * SG_FEET_TO_METER;
                 // cout << "dist = " << x << " height = " << y << endl;
-                double angle = asin( y / x ) * SGD_RADIANS_TO_DEGREES;
+                double angle = atan2( y, x ) * SGD_RADIANS_TO_DEGREES;
                 r = (target_gs - angle) * 5.0;
                 r *= signal_quality_norm;
             }