From 23cdb0d3020f5beca54bb72736163c88a520cdb2 Mon Sep 17 00:00:00 2001
From: ThorstenB <brehmt@gmail.com>
Date: Wed, 4 Jan 2012 00:00:10 +0100
Subject: [PATCH] #561: keep magnetic heading within limits when mag-variation
 is negative Thanks to Hyde!

---
 src/Main/fg_props.cxx | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/Main/fg_props.cxx b/src/Main/fg_props.cxx
index c12026434..1e6240570 100644
--- a/src/Main/fg_props.cxx
+++ b/src/Main/fg_props.cxx
@@ -367,7 +367,8 @@ getHeadingMag ()
 {
   double magheading;
   magheading = fgGetDouble("/orientation/heading-deg") - getMagVar();
-  if (magheading < 0) magheading += 360;
+  if (magheading <= 0) magheading += 360;
+  else if (magheading > 360) magheading -= 360;
   return magheading;
 }
 
@@ -379,7 +380,8 @@ getTrackMag ()
 {
   double magtrack;
   magtrack = fgGetDouble("/orientation/track-deg") - getMagVar();
-  if (magtrack < 0) magtrack += 360;
+  if (magtrack <= 0) magtrack += 360;
+  else if (magtrack > 360) magtrack -= 360;
   return magtrack;
 }