From 1a05695ff5bf34bdc407fa2647f07d4aca336204 Mon Sep 17 00:00:00 2001
From: jmt <jmt>
Date: Fri, 2 Jan 2009 12:34:28 +0000
Subject: [PATCH] NaN fix by Csaba/Jester - prefer atan2(x,y) to atan(a/y).

---
 src/AIModel/AICarrier.cxx | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/AIModel/AICarrier.cxx b/src/AIModel/AICarrier.cxx
index 1a9a1d2b7..979e9710b 100644
--- 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