Fix a couple of issues valgrind identified.

src/Instrumentation/gps.cxx

@@ -107,6 +107,12 @@ GPS::GPS ( SGPropertyNode *node, bool defaultGPSMode) :
   
   SGPropertyNode *wp_node = _gpsNode->getChild("wp", 0, true);
   _currentWayptNode = wp_node->getChild("wp", 1, true);
+    
+#if FG_210_COMPAT
+    _searchIsRoute = false;
+    _searchHasNext = false;
+    _searchType = FGPositioned::INVALID;
+#endif
 }
 
 GPS::~GPS ()

src/Instrumentation/transponder.cxx

@@ -48,6 +48,7 @@ const int INVALID_ID = -9999;
 
 Transponder::Transponder(SGPropertyNode *node)
     :
+    _identMode(false),
     _name(node->getStringValue("name", "transponder")),
     _num(node->getIntValue("number", 0)),
     _mode((Mode) node->getIntValue("mode", 1)),