diff --git a/MapControl/Shared/Etrs89UtmProjection.cs b/MapControl/Shared/Etrs89UtmProjection.cs
index 9c9d6a5d..fbd6316d 100644
--- a/MapControl/Shared/Etrs89UtmProjection.cs
+++ b/MapControl/Shared/Etrs89UtmProjection.cs
@@ -32,7 +32,7 @@ namespace MapControl
             EquatorialRadius = 6378137d;
             Flattening = 1d / 298.257222101;
             ScaleFactor = 0.9996;
-            CentralMeridian = Zone * 6d - 183d;
+            CentralMeridian = zone * 6d - 183d;
             FalseEasting = 5e5;
             FalseNorthing = 0d;
         }
diff --git a/MapControl/Shared/Nad27UtmProjection.cs b/MapControl/Shared/Nad27UtmProjection.cs
index 32f707c9..27dc4c4d 100644
--- a/MapControl/Shared/Nad27UtmProjection.cs
+++ b/MapControl/Shared/Nad27UtmProjection.cs
@@ -32,7 +32,7 @@ namespace MapControl
             EquatorialRadius = 6378206.4;
             Flattening = 1d / 294.978698213898;
             ScaleFactor = 0.9996;
-            CentralMeridian = Zone * 6d - 183d;
+            CentralMeridian = zone * 6d - 183d;
             FalseEasting = 5e5;
             FalseNorthing = 0d;
         }
diff --git a/MapControl/Shared/Nad83UtmProjection.cs b/MapControl/Shared/Nad83UtmProjection.cs
index d73c5e39..a6343294 100644
--- a/MapControl/Shared/Nad83UtmProjection.cs
+++ b/MapControl/Shared/Nad83UtmProjection.cs
@@ -32,7 +32,7 @@ namespace MapControl
             EquatorialRadius = 6378137d;
             Flattening = 1d / 298.257222101;
             ScaleFactor = 0.9996;
-            CentralMeridian = Zone * 6d - 183d;
+            CentralMeridian = zone * 6d - 183d;
             FalseEasting = 5e5;
             FalseNorthing = 0d;
         }
diff --git a/MapControl/Shared/PolarStereographicProjection.cs b/MapControl/Shared/PolarStereographicProjection.cs
index bc28dfcc..43107a4b 100644
--- a/MapControl/Shared/PolarStereographicProjection.cs
+++ b/MapControl/Shared/PolarStereographicProjection.cs
@@ -94,12 +94,11 @@ namespace MapControl
             }
 
             var e = Math.Sqrt((2d - Flattening) * Flattening);
-
             var r = Math.Sqrt(x * x + y * y); // p.162 (20-18)
             var t = r * Math.Sqrt(Math.Pow(1d + e, 1d + e) * Math.Pow(1d - e, 1d - e))
                   / (2d * EquatorialRadius * ScaleFactor); // p.162 (21-39)
 
-            var lat = WorldMercatorProjection.LatitudeFromSeriesApproximation(e, t); // p.162 (3-5)
+            var lat = WorldMercatorProjection.ApproximateLatitude(e, t); // p.162 (3-5)
             var lon = Math.Atan2(x, -y); // p.162 (20-16)
 
             if (!IsNorth)
diff --git a/MapControl/Shared/TransverseMercatorProjection.cs b/MapControl/Shared/TransverseMercatorProjection.cs
index e34f557d..3057094d 100644
--- a/MapControl/Shared/TransverseMercatorProjection.cs
+++ b/MapControl/Shared/TransverseMercatorProjection.cs
@@ -15,12 +15,6 @@ namespace MapControl
     /// </summary>
     public class TransverseMercatorProjection : MapProjection
     {
-#if NETFRAMEWORK || UWP
-        private static double Math_Atanh(double x) => Math.Log((1d + x) / (1d - x)) / 2d;
-#else
-        private static double Math_Atanh(double x) => Math.Atanh(x);
-#endif
-
         public double EquatorialRadius { get; set; } = Wgs84EquatorialRadius;
         public double Flattening { get; set; } = Wgs84Flattening;
         public double ScaleFactor { get; set; } = 0.9996;
@@ -35,19 +29,22 @@ namespace MapControl
 
         public override Point GetRelativeScale(Location location)
         {
-            // Precise enough, avoid calculations as in LocationToMap.
-            //
             return new Point(ScaleFactor, ScaleFactor);
         }
 
         public override Point? LocationToMap(Location location)
         {
+#if NETFRAMEWORK || UWP
+            double Atanh(double x) => Math.Log((1d + x) / (1d - x)) / 2d;
+#else
+            static double Atanh(double x) => Math.Atanh(x);
+#endif
             var n = Flattening / (2d - Flattening);
             var n2 = n * n;
             var n3 = n * n2;
-
             var k0A = ScaleFactor * EquatorialRadius / (1d + n) * (1d + n2 / 4d + n2 * n2 / 64d);
 
+            // α_j
             var alpha1 = n / 2d - n2 * 2d / 3d + n3 * 5d / 16d;
             var alpha2 = n2 * 13d / 48d - n3 * 3d / 5d;
             var alpha3 = n3 * 61d / 240d;
@@ -59,15 +56,14 @@ namespace MapControl
             var lambda = (location.Longitude - CentralMeridian) * Math.PI / 180d;
 
             var s = 2d * Math.Sqrt(n) / (1d + n);
-            var sinLat = Math.Sin(phi);
-
-            var t = Math.Sinh(Math_Atanh(sinLat) - s * Math_Atanh(s * sinLat));
+            var sinPhi = Math.Sin(phi);
+            var t = Math.Sinh(Atanh(sinPhi) - s * Atanh(s * sinPhi));
 
             // ξ'
             var xi_ = Math.Atan(t / Math.Cos(lambda));
 
             // η'
-            var eta_ = Math_Atanh(Math.Sin(lambda) / Math.Sqrt(1d + t * t));
+            var eta_ = Atanh(Math.Sin(lambda) / Math.Sqrt(1d + t * t));
 
             // ξ
             var xi = xi_
@@ -91,13 +87,14 @@ namespace MapControl
             var n = Flattening / (2d - Flattening);
             var n2 = n * n;
             var n3 = n * n2;
-
             var k0A = ScaleFactor * EquatorialRadius / (1d + n) * (1d + n2 / 4d + n2 * n2 / 64d);
 
+            // β_j
             var beta1 = n / 2d - n2 * 2d / 3d + n3 * 37d / 96d;
             var beta2 = n2 / 48d + n3 / 15d;
             var beta3 = n3 * 17d / 480d;
 
+            // δ_j
             var delta1 = n * 2d - n2 * 2d / 3d - n3 * 2d;
             var delta2 = n2 * 7d / 3d - n3 * 8d / 5d;
             var delta3 = n3 * 56d / 15d;
diff --git a/MapControl/Shared/Wgs84UtmProjection.cs b/MapControl/Shared/Wgs84UtmProjection.cs
index 0697f1bc..77e7e216 100644
--- a/MapControl/Shared/Wgs84UtmProjection.cs
+++ b/MapControl/Shared/Wgs84UtmProjection.cs
@@ -24,6 +24,11 @@ namespace MapControl
         public Wgs84UtmProjection(int zone, bool north)
         {
             SetZone(zone, north);
+
+            EquatorialRadius = Wgs84EquatorialRadius;
+            Flattening = Wgs84Flattening;
+            ScaleFactor = 0.9996;
+            FalseEasting = 5e5;
         }
 
         protected void SetZone(int zone, bool north)
@@ -36,12 +41,8 @@ namespace MapControl
             Zone = zone;
             IsNorth = north;
             CrsId = $"EPSG:{(north ? 32600 : 32700) + zone}";
-            EquatorialRadius = Wgs84EquatorialRadius;
-            Flattening = Wgs84Flattening;
-            ScaleFactor = 0.9996;
-            CentralMeridian = Zone * 6d - 183d;
-            FalseEasting = 5e5;
-            FalseNorthing = IsNorth ? 0d : 1e7;
+            CentralMeridian = zone * 6d - 183d;
+            FalseNorthing = north ? 0d : 1e7;
         }
     }
 
diff --git a/MapControl/Shared/WorldMercatorProjection.cs b/MapControl/Shared/WorldMercatorProjection.cs
index 62f1dd37..f74d5a7d 100644
--- a/MapControl/Shared/WorldMercatorProjection.cs
+++ b/MapControl/Shared/WorldMercatorProjection.cs
@@ -75,10 +75,10 @@ namespace MapControl
         {
             var t = Math.Exp(-y * Math.PI / 180d); // p.44 (7-10)
 
-            return LatitudeFromSeriesApproximation(Wgs84Eccentricity, t) * 180d / Math.PI;
+            return ApproximateLatitude(Wgs84Eccentricity, t) * 180d / Math.PI;
         }
 
-        internal static double LatitudeFromSeriesApproximation(double e, double t)
+        internal static double ApproximateLatitude(double e, double t)
         {
             var e_2 = e * e;
             var e_4 = e_2 * e_2;