diff --git a/MapControl/Shared/MapProjection.cs b/MapControl/Shared/MapProjection.cs
index 2f8df08c..288f513a 100644
--- a/MapControl/Shared/MapProjection.cs
+++ b/MapControl/Shared/MapProjection.cs
@@ -41,6 +41,14 @@ namespace MapControl
             set;
         }
 
+        /// <summary>
+        /// Creates a MapProjection instance from a CRS identifier string.
+        /// </summary>
+        public static MapProjection Parse(string crsId)
+        {
+            return Factory.GetProjection(crsId);
+        }
+
         /// <summary>
         /// Gets the type of the projection.
         /// </summary>
@@ -54,7 +62,24 @@ namespace MapControl
         /// <summary>
         /// Gets or sets an optional projection center.
         /// </summary>
-        public virtual Location Center { get; protected internal set; } = new Location();
+        public Location Center
+        {
+            get => field ??= new Location();
+            protected internal set
+            {
+                var longitude = Location.NormalizeLongitude(value.Longitude);
+
+                if (field == null || !field.Equals(value.Latitude, longitude))
+                {
+                    field = new Location(value.Latitude, longitude);
+                    CenterChanged();
+                }
+            }
+        }
+
+        protected virtual void CenterChanged()
+        {
+        }
 
         /// <summary>
         /// Gets the relative map scale at the specified geographic coordinates.
@@ -158,13 +183,5 @@ namespace MapControl
         {
             return CrsId;
         }
-
-        /// <summary>
-        /// Creates a MapProjection instance from a CRS identifier string.
-        /// </summary>
-        public static MapProjection Parse(string crsId)
-        {
-            return Factory.GetProjection(crsId);
-        }
     }
 }
diff --git a/MapControl/Shared/Wgs84AutoTmProjection.cs b/MapControl/Shared/Wgs84AutoTmProjection.cs
index 05b6dce7..aa002149 100644
--- a/MapControl/Shared/Wgs84AutoTmProjection.cs
+++ b/MapControl/Shared/Wgs84AutoTmProjection.cs
@@ -17,14 +17,9 @@
             CrsId = crsId;
         }
 
-        public override Location Center
+        protected override void CenterChanged()
         {
-            get => base.Center;
-            protected internal set
-            {
-                base.Center = value;
-                CentralMeridian = value.Longitude;
-            }
+            CentralMeridian = Center.Longitude;
         }
     }
 }
diff --git a/MapControl/Shared/Wgs84AutoUtmProjection.cs b/MapControl/Shared/Wgs84AutoUtmProjection.cs
index 7ca5f684..cb0cb6e5 100644
--- a/MapControl/Shared/Wgs84AutoUtmProjection.cs
+++ b/MapControl/Shared/Wgs84AutoUtmProjection.cs
@@ -29,28 +29,18 @@ namespace MapControl
             }
         }
 
-        public override Location Center
+        protected override void CenterChanged()
         {
-            get => base.Center;
-            protected internal set
+            var zone = (int)Math.Floor(Center.Longitude / 6d) + 31;
+            var hemisphere = Center.Latitude >= 0d ? Hemisphere.North : Hemisphere.South;
+
+            if (Zone != zone || Hemisphere != hemisphere)
             {
-                if (!base.Center.Equals(value))
+                SetZone(zone, hemisphere);
+
+                if (!string.IsNullOrEmpty(autoCrsId))
                 {
-                    base.Center = value;
-
-                    var lon = Location.NormalizeLongitude(value.Longitude);
-                    var zone = (int)Math.Floor(lon / 6d) + 31;
-                    var hemisphere = value.Latitude >= 0d ? Hemisphere.North : Hemisphere.South;
-
-                    if (Zone != zone || Hemisphere != hemisphere)
-                    {
-                        SetZone(zone, hemisphere);
-
-                        if (!string.IsNullOrEmpty(autoCrsId))
-                        {
-                            CrsId = autoCrsId;
-                        }
-                    }
+                    CrsId = autoCrsId;
                 }
             }
         }
diff --git a/MapProjections/Shared/Wgs84AutoUtmProjection.cs b/MapProjections/Shared/Wgs84AutoUtmProjection.cs
index 18c03ce1..99fdaf21 100644
--- a/MapProjections/Shared/Wgs84AutoUtmProjection.cs
+++ b/MapProjections/Shared/Wgs84AutoUtmProjection.cs
@@ -27,28 +27,18 @@ namespace MapControl.Projections
             }
         }
 
-        public override Location Center
+        protected override void CenterChanged()
         {
-            get => base.Center;
-            protected set
+            var zone = (int)Math.Floor(Center.Longitude / 6d) + 31;
+            var hemisphere = Center.Latitude >= 0d ? Hemisphere.North : Hemisphere.South;
+
+            if (Zone != zone || Hemisphere != hemisphere)
             {
-                if (!base.Center.Equals(value))
+                SetZone(zone, hemisphere);
+
+                if (!string.IsNullOrEmpty(autoCrsId))
                 {
-                    base.Center = value;
-
-                    var lon = Location.NormalizeLongitude(value.Longitude);
-                    var zone = (int)Math.Floor(lon / 6d) + 31;
-                    var hemisphere = value.Latitude >= 0d ? Hemisphere.North : Hemisphere.South;
-
-                    if (Zone != zone || Hemisphere != hemisphere)
-                    {
-                        SetZone(zone, hemisphere);
-
-                        if (!string.IsNullOrEmpty(autoCrsId))
-                        {
-                            CrsId = autoCrsId;
-                        }
-                    }
+                    CrsId = autoCrsId;
                 }
             }
         }
diff --git a/MapProjections/Shared/Wgs84OrthographicProjection.cs b/MapProjections/Shared/Wgs84OrthographicProjection.cs
index aa6a04b0..57458f59 100644
--- a/MapProjections/Shared/Wgs84OrthographicProjection.cs
+++ b/MapProjections/Shared/Wgs84OrthographicProjection.cs
@@ -1,5 +1,4 @@
-
-using System.Globalization;
+using System.Globalization;
 
 namespace MapControl.Projections
 {
@@ -7,17 +6,12 @@ namespace MapControl.Projections
     {
         public Wgs84OrthographicProjection()
         {
-            Center = base.Center;
+            CenterChanged();
         }
 
-        public override Location Center
+        protected override void CenterChanged()
         {
-            get => base.Center;
-            protected set
-            {
-                base.Center = value;
-
-                var wktFormat =
+            var wktFormat =
                     "PROJCS[\"WGS 84 / World Mercator\"," +
                     WktConstants.GeogCsWgs84 + "," +
                     "PROJECTION[\"Orthographic\"]," +
@@ -28,9 +22,8 @@ namespace MapControl.Projections
                     "AXIS[\"Northing\",NORTH]" +
                     "AUTHORITY[\"AUTO2\",\"42003\"]]";
 
-                CoordinateSystemWkt = string.Format(
-                    CultureInfo.InvariantCulture, wktFormat, value.Latitude, value.Longitude);
-            }
+            CoordinateSystemWkt = string.Format(
+                CultureInfo.InvariantCulture, wktFormat, Center.Latitude, Center.Longitude);
         }
     }
 }
diff --git a/MapProjections/Shared/Wgs84StereographicProjection.cs b/MapProjections/Shared/Wgs84StereographicProjection.cs
index 06473746..0ed274df 100644
--- a/MapProjections/Shared/Wgs84StereographicProjection.cs
+++ b/MapProjections/Shared/Wgs84StereographicProjection.cs
@@ -1,5 +1,4 @@
-
-using System.Globalization;
+using System.Globalization;
 
 namespace MapControl.Projections
 {
@@ -7,30 +6,24 @@ namespace MapControl.Projections
     {
         public Wgs84StereographicProjection()
         {
-            Center = base.Center;
+            CenterChanged();
         }
 
-        public override Location Center
+        protected override void CenterChanged()
         {
-            get => base.Center;
-            protected set
-            {
-                base.Center = value;
+            var wktFormat =
+                "PROJCS[\"WGS 84 / World Mercator\"," +
+                WktConstants.GeogCsWgs84 + "," +
+                "PROJECTION[\"Oblique_Stereographic\"]," +
+                "PARAMETER[\"latitude_of_origin\",{0:0.########}]," +
+                "PARAMETER[\"central_meridian\",{1:0.########}]," +
+                "UNIT[\"metre\",1,AUTHORITY[\"EPSG\",\"9001\"]]," +
+                "AXIS[\"Easting\",EAST]," +
+                "AXIS[\"Northing\",NORTH]" +
+                "AUTHORITY[\"AUTO2\",\"97002\"]]";
 
-                var wktFormat =
-                    "PROJCS[\"WGS 84 / World Mercator\"," +
-                    WktConstants.GeogCsWgs84 + "," +
-                    "PROJECTION[\"Oblique_Stereographic\"]," +
-                    "PARAMETER[\"latitude_of_origin\",{0:0.########}]," +
-                    "PARAMETER[\"central_meridian\",{1:0.########}]," +
-                    "UNIT[\"metre\",1,AUTHORITY[\"EPSG\",\"9001\"]]," +
-                    "AXIS[\"Easting\",EAST]," +
-                    "AXIS[\"Northing\",NORTH]" +
-                    "AUTHORITY[\"AUTO2\",\"97002\"]]";
-
-                CoordinateSystemWkt = string.Format(
-                    CultureInfo.InvariantCulture, wktFormat, value.Latitude, value.Longitude);
-            }
+            CoordinateSystemWkt = string.Format(
+                CultureInfo.InvariantCulture, wktFormat, Center.Latitude, Center.Longitude);
         }
     }
 }