navradio: set receiver's signal-quality-norm to 0 when navaid station

[flightgear.git] / src / Instrumentation / mrg.cxx

diff --git a/src/Instrumentation/mrg.cxx b/src/Instrumentation/mrg.cxx
index 365447b45a99f45ce519b321d5c156d45ad6d56c..8146cd1f9747c82a31113a0978ef93f41c8ea781 100644 (file)
--- a/src/Instrumentation/mrg.cxx
+++ b/src/Instrumentation/mrg.cxx
@@ -22,6 +22,8 @@
 
 const double MasterReferenceGyro::gravity = -32.1740485564;
 
+using std::string;
+
 MasterReferenceGyro::MasterReferenceGyro ( SGPropertyNode *node ) :
 _name(node->getStringValue("name", "master-reference-gyro")),
 _num(node->getIntValue("number", 0))