X-Git-Url: https://git.mxchange.org/?a=blobdiff_plain;f=src%2FInstrumentation%2Fheading_indicator.cxx;h=2cbbb9f2469b31e9fbf2dd39e318d24a17d8d3fa;hb=19e716397136f25e11187bcc025d13eeaeac346c;hp=f7899b7bcb90294e76ee5bdd7351c885380adc3a;hpb=b1b4b7ecf48c4420d4445979c36cbf3f80be616a;p=flightgear.git

diff --git a/src/Instrumentation/heading_indicator.cxx b/src/Instrumentation/heading_indicator.cxx
index f7899b7bc..2cbbb9f24 100644
--- a/src/Instrumentation/heading_indicator.cxx
+++ b/src/Instrumentation/heading_indicator.cxx
@@ -3,6 +3,10 @@
 //
 // This file is in the Public Domain and comes with no warranty.
 
+#ifdef HAVE_CONFIG_H
+#  include "config.h"
+#endif
+
 #include <simgear/compiler.h>
 #include <simgear/sg_inlines.h>
 #include <iostream>
@@ -13,6 +17,7 @@
 #include <Main/fg_props.hxx>
 #include <Main/util.hxx>
 
+#include <simgear/magvar/magvar.hxx>
 
 HeadingIndicator::HeadingIndicator ( SGPropertyNode *node )
     :
@@ -33,7 +38,10 @@ HeadingIndicator::init ()
     branch = "/instrumentation/" + _name;
 
     SGPropertyNode *node = fgGetNode(branch.c_str(), _num, true );
-    _offset_node = node->getChild("offset-deg", 0, true);
+    if( NULL == (_offset_node = node->getChild("offset-deg", 0, false)) ) {
+      _offset_node = node->getChild("offset-deg", 0, true);
+      _offset_node->setDoubleValue( -globals->get_mag()->get_magvar() * SGD_RADIANS_TO_DEGREES );
+    }
     _heading_in_node = fgGetNode("/orientation/heading-deg", true);
     _suction_node = fgGetNode(_suction.c_str(), true);
     _heading_out_node = node->getChild("indicated-heading-deg", 0, true);