+void FGNavRecord::alignLocaliserWithRunway(double aThreshold)
+{
+// find the distance from the threshold to the localizer
+ SGGeod runwayThreshold(mRunway->threshold());
+ double dist, az1, az2;
+ SGGeodesy::inverse(mPosition, runwayThreshold, az1, az2, dist);
+
+// back project that distance along the runway center line
+ SGGeod newPos = mRunway->pointOnCenterline(dist);
+
+ double hdg_diff = get_multiuse() - mRunway->headingDeg();
+ SG_NORMALIZE_RANGE(hdg_diff, -180.0, 180.0);
+
+ if ( fabs(hdg_diff) <= aThreshold ) {
+ mPosition = newPos;
+ set_multiuse( mRunway->headingDeg() );
+ } else {
+ SG_LOG(SG_GENERAL, SG_WARN, "localizer:" << ident() << ", aligning with runway "
+ << mRunway->ident() << " exceeded heading threshold");
+ }
+}