diff --git a/src/Airports/calc_loc.cxx b/src/Airports/calc_loc.cxx
index 0b3074024..dd45e41c3 100644
--- a/src/Airports/calc_loc.cxx
+++ b/src/Airports/calc_loc.cxx
@@ -42,7 +42,7 @@ int main( int argc, char **argv ) {
     }
 
     // calculate runway threshold point
-    double thresh_lat, thresh_lon, return_az;
+    double thresh_lat = 0.0, thresh_lon = 0.0, return_az = 0.0;
     geo_direct_wgs_84 ( 0.0, rwy_lat, rwy_lon, rwy_hdg, 
                         rwy_len / 2.0, &thresh_lat, &thresh_lon, &return_az );
     cout << "Threshold = " << thresh_lat << "," << thresh_lon << endl;
@@ -54,7 +54,7 @@ int main( int argc, char **argv ) {
     cout << "Distance = " << dist_m << endl;
 
     // back project that distance along the runway center line
-    double nloc_lat, nloc_lon;
+    double nloc_lat = 0.0, nloc_lon = 0.0;
     geo_direct_wgs_84 ( 0.0, thresh_lat, thresh_lon, rwy_hdg + 180.0, 
                         dist_m, &nloc_lat, &nloc_lon, &return_az );
     printf("New localizer = %.6f %.6f\n", nloc_lat, nloc_lon );
diff --git a/src/Airports/dynamicloader.cxx b/src/Airports/dynamicloader.cxx
index 6dd15a352..10cc253ba 100644
--- a/src/Airports/dynamicloader.cxx
+++ b/src/Airports/dynamicloader.cxx
@@ -117,6 +117,8 @@ void  FGAirportDynamicsXMLLoader::startElement (const char * name, const XMLAttr
                  holdPointType=3;
             } else if (attval==string("PushBack")) {
                  holdPointType=3;
+            } else {
+                 holdPointType=0;
             }
             //cerr << "Setting Holding point to " << holdPointType << endl;
             taxiNode.setHoldPointType(holdPointType);
diff --git a/src/Airports/dynamics.cxx b/src/Airports/dynamics.cxx
index 8fd14162b..3e658a147 100644
--- a/src/Airports/dynamics.cxx
+++ b/src/Airports/dynamics.cxx
@@ -536,9 +536,9 @@ const string& FGAirportDynamics::getId() const {
 // so that at least I can start working on assigning different frequencies to different
 // operations.
 
-int FGAirportDynamics::getGroundFrequency(int leg) { 
+int FGAirportDynamics::getGroundFrequency(unsigned leg) { 
      //return freqGround.size() ? freqGround[0] : 0; };
-     int groundFreq;
+     int groundFreq = 0;
      if (leg < 2) {
          SG_LOG(SG_ATC, SG_ALERT, "Leg value is smaller than two at " << SG_ORIGIN);
      }
diff --git a/src/Airports/dynamics.hxx b/src/Airports/dynamics.hxx
index 56bef8225..1f142eb52 100644
--- a/src/Airports/dynamics.hxx
+++ b/src/Airports/dynamics.hxx
@@ -117,7 +117,7 @@ public:
   FGTowerController   *getTowerController()   { return &towerController; };
 
   const string& getAtisInformation() { return atisInformation; };
-  int getGroundFrequency(int leg); //{ return freqGround.size() ? freqGround[0] : 0; };
+  int getGroundFrequency(unsigned leg); //{ return freqGround.size() ? freqGround[0] : 0; };
 
   void setRwyUse(const FGRunwayPreference& ref);
 };
diff --git a/src/Airports/groundnetwork.cxx b/src/Airports/groundnetwork.cxx
index 529fc5952..f1e0e086f 100644
--- a/src/Airports/groundnetwork.cxx
+++ b/src/Airports/groundnetwork.cxx
@@ -267,11 +267,11 @@ void FGGroundNetwork::init()
       {
 	if ((*j)->getEnd()->getIndex() == (*i)->getStart()->getIndex())
 	  {
-	    int start1 = (*i)->getStart()->getIndex();
-	    int end1   = (*i)->getEnd()  ->getIndex();
-	    int start2 = (*j)->getStart()->getIndex();
-	    int end2   = (*j)->getEnd()->getIndex();
-	    int oppIndex = (*j)->getIndex();
+//	    int start1 = (*i)->getStart()->getIndex();
+//	    int end1   = (*i)->getEnd()  ->getIndex();
+//	    int start2 = (*j)->getStart()->getIndex();
+//	    int end2   = (*j)->getEnd()->getIndex();
+//	    int oppIndex = (*j)->getIndex();
 	    //cerr << "Opposite of  " << (*i)->getIndex() << " (" << start1 << "," << end1 << ") "
 	    //	 << "happens to be " << oppIndex      << " (" << start2 << "," << end2 << ") " << endl;
 	    (*i)->setOpposite(*j);
@@ -316,7 +316,7 @@ int FGGroundNetwork::findNearestNode(double lat, double lon)
   return findNearestNode(SGGeod::fromDeg(lon, lat));
 }
 
-FGTaxiNode *FGGroundNetwork::findNode(int idx)
+FGTaxiNode *FGGroundNetwork::findNode(unsigned idx)
 { /*
     for (FGTaxiNodeVectorIterator 
     itr = nodes.begin();
@@ -332,7 +332,7 @@ FGTaxiNode *FGGroundNetwork::findNode(int idx)
     return 0;
 }
 
-FGTaxiSegment *FGGroundNetwork::findSegment(int idx)
+FGTaxiSegment *FGGroundNetwork::findSegment(unsigned idx)
 {/*
   for (FGTaxiSegmentVectorIterator 
 	 itr = segments.begin();
diff --git a/src/Airports/groundnetwork.hxx b/src/Airports/groundnetwork.hxx
index f1a7093a7..10a78b275 100644
--- a/src/Airports/groundnetwork.hxx
+++ b/src/Airports/groundnetwork.hxx
@@ -256,8 +256,8 @@ public:
   int findNearestNode(double lat, double lon);
   int findNearestNode(const SGGeod& aGeod);
   
-  FGTaxiNode *findNode(int idx);
-  FGTaxiSegment *findSegment(int idx);
+  FGTaxiNode *findNode(unsigned idx);
+  FGTaxiSegment *findSegment(unsigned idx);
   FGTaxiRoute findShortestRoute(int start, int end, bool fullSearch=true);
   //void trace(FGTaxiNode *, int, int, double dist);