diff --git a/src/Airports/GenAirports/beznode.hxx b/src/Airports/GenAirports/beznode.hxx
index a842f797..4265e242 100644
--- a/src/Airports/GenAirports/beznode.hxx
+++ b/src/Airports/GenAirports/beznode.hxx
@@ -20,12 +20,11 @@ inline SGGeod CalculateLinearLocation(const SGGeod& p0, const SGGeod& p1, double
     // how expensive would this be to do in Geodetic math?
     SGVec2d v0 = SGVec2d(p0.getLongitudeDeg(), p0.getLatitudeDeg());
     SGVec2d v1 = SGVec2d(p1.getLongitudeDeg(), p1.getLatitudeDeg());
-    SGVec2d result;
 
     double term1 = (1.0f - t);
     double term2 = t;
 
-    result = (v0 * term1) + (v1 * term2);
+    SGVec2d result = (v0 * term1) + (v1 * term2);
 
     return SGGeod::fromDeg(result.x(), result.y());
 }
@@ -40,13 +39,12 @@ inline SGGeod CalculateQuadraticLocation(const SGGeod& p0, const SGGeod& cp, con
     SGVec2d v0 = SGVec2d(p0.getLongitudeDeg(), p0.getLatitudeDeg());
     SGVec2d v1 = SGVec2d(p1.getLongitudeDeg(), p1.getLatitudeDeg());
     SGVec2d vcp = SGVec2d(cp.getLongitudeDeg(), cp.getLatitudeDeg());
-    SGVec2d result;
 
     double term1 = (1.0f - t) * (1.0f - t);
-    double term2 = 2 * (1.0f - t) * t;
+    double term2 = 2.0 * (1.0f - t) * t;
     double term3 = t * t;
 
-    result = (v0 * term1) + (vcp * term2) + (v1 * term3);
+    SGVec2d result = (v0 * term1) + (vcp * term2) + (v1 * term3);
 
     return SGGeod::fromDeg(result.x(), result.y());
 }
@@ -65,8 +63,8 @@ inline SGGeod CalculateCubicLocation(const SGGeod& p0, const SGGeod& cp0, const
     SGVec2d result;
 
     double term1 = (1.0f - t) * (1.0f - t) * (1.0f - t);
-    double term2 = 3 * (1.0f - t) * (1.0f - t) * t;
-    double term3 = 3 * (1.0f - t) * t * t;
+    double term2 = 3.0 * (1.0f - t) * (1.0f - t) * t;
+    double term3 = 3.0 * (1.0f - t) * t * t;
     double term4 = t * t * t;
 
     result = (v0 * term1) + (vcp0 * term2) + (vcp1 * term3) + (v1 * term4);
@@ -105,14 +103,14 @@ inline double CalculateTheta(const SGVec3d& dirCur, const SGVec3d& dirNext, cons
 }
 
 
-#define BEZIER_DETAIL (8)
-#define LINE_WIDTH (0.75)
-#define WIREFRAME (1)
+#define BEZIER_DETAIL   (8)
+#define LINE_WIDTH      (0.75)
+#define WIREFRAME       (1)
 
-#define CURVE_NONE (0)
-#define CURVE_LINEAR (1)
+#define CURVE_NONE      (0)
+#define CURVE_LINEAR    (1)
 #define CURVE_QUADRATIC (2)
-#define CURVE_CUBIC (3)
+#define CURVE_CUBIC     (3)
 
 
 class BezNode
@@ -150,13 +148,13 @@ public:
     {
     }
 
-    SGGeod Mirror(const SGGeod& pt)
+    SGGeod Mirror(const SGGeod& pt) const
     {
         double heading, az2, dist;
 
         // mirror given point about our location
         SGGeodesy::inverse(loc, pt, heading, az2, dist);
-        heading = SGMiscd::normalizePeriodic(0, 360, heading + 180);
+        heading = SGMiscd::normalizePeriodic(0.0, 360.0, heading + 180.0);
 
         return SGGeodesy::direct(loc, heading, dist);
     }
@@ -166,7 +164,7 @@ public:
         mark = m;
     }
 
-    unsigned int GetMarking()
+    unsigned int GetMarking() const
     {
         return mark;
     }
@@ -176,7 +174,7 @@ public:
         light = l;
     }
 
-    unsigned int GetLighting()
+    unsigned int GetLighting() const
     {
         return light;
     }
@@ -191,37 +189,37 @@ public:
         term = t;
     }
 
-    bool IsAt(double lat, double lon)
+    bool IsAt(double lat, double lon) const
     {
         return ((loc.getLatitudeDeg() == lat) && (loc.getLongitudeDeg() == lon));
     }
 
-    bool HasPrevCp()
+    bool HasPrevCp() const
     {
         return has_prev_cp;
     }
 
-    bool HasNextCp()
+    bool HasNextCp() const
     {
         return has_next_cp;
     }
 
-    SGGeod GetLoc()
+    SGGeod GetLoc() const
     {
         return loc;
     }
 
-    SGGeod GetPrevCp()
+    SGGeod GetPrevCp() const
     {
         return prev_cp;
     }
 
-    SGGeod GetNextCp()
+    SGGeod GetNextCp() const
     {
         return next_cp;
     }
 
-    void ClearNextCp(void)
+    void ClearNextCp()
     {
         has_next_cp = false;
     }
@@ -232,12 +230,12 @@ public:
         has_next_cp = true;
     }
 
-    void Print()
+    void Print() const
     {
         TG_LOG(SG_GENERAL, SG_DEBUG,
                "\tLoc:     " << loc << "\n"
-                             << "\tprev_cp: " << prev_cp << "\n"
-                             << "\tnext_cp: " << next_cp << "\n");
+               << "\tprev_cp: " << prev_cp << "\n"
+               << "\tnext_cp: " << next_cp << "\n");
     }
 
 private:
@@ -247,8 +245,8 @@ private:
     SGGeod next_cp;
     bool has_next_cp;
 
-    unsigned int mark;
-    unsigned int light;
+    unsigned mark;
+    unsigned light;
     bool term;
     bool close;
 };