From 9a5080b6ad29db80dd1d0c8ed2a577aec55b16ca Mon Sep 17 00:00:00 2001
From: david <david>
Date: Sun, 27 Oct 2002 20:32:34 +0000
Subject: [PATCH] Fixed jump around the north indication.

---
 src/Instrumentation/heading_indicator.cxx | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/src/Instrumentation/heading_indicator.cxx b/src/Instrumentation/heading_indicator.cxx
index dc939c598..5ca92fd6e 100644
--- a/src/Instrumentation/heading_indicator.cxx
+++ b/src/Instrumentation/heading_indicator.cxx
@@ -83,6 +83,15 @@ HeadingIndicator::update (double dt)
                                 // introducing errors.
     double factor = 0.01 / (spin * spin * spin * spin * spin * spin);
     double heading = _heading_in_node->getDoubleValue();
+
+                                // Now, we have to get the current
+                                // heading and the last heading into
+                                // the same range.
+    while ((heading - _last_heading_deg) > 180)
+        _last_heading_deg += 360;
+    while ((heading - _last_heading_deg) < -180)
+        _last_heading_deg -= 360;
+
     heading = fgGetLowPass(_last_heading_deg, heading, dt/factor);
     _last_heading_deg = heading;
 
-- 
2.39.5