NaN fix by Csaba/Jester - prefer atan2(x,y) to atan(a/y).

diff --git a/src/AIModel/AICarrier.cxx b/src/AIModel/AICarrier.cxx
index 1a9a1d2b72dc51fddfadfd4ed221ca26b474a3c7..979e9710bc471eb49e562201eaa5ff7745c15ffa 100644 (file)
--- a/src/AIModel/AICarrier.cxx
+++ b/src/AIModel/AICarrier.cxx
@@ -514,7 +514,7 @@ void FGAICarrier::UpdateWind( double dt) {
     + (rel_wind_speed_from_north_kts * rel_wind_speed_from_north_kts));
 
     //calculate the relative wind direction
-    rel_wind_from_deg = atan(rel_wind_speed_from_east_kts/rel_wind_speed_from_north_kts)
+    rel_wind_from_deg = atan2(rel_wind_speed_from_east_kts, rel_wind_speed_from_north_kts)
                             * SG_RADIANS_TO_DEGREES;
 
     // rationalise the output