diff --git a/MapControl/Shared/BoundingBox.cs b/MapControl/Shared/BoundingBox.cs
index fbde6955..6a505366 100644
--- a/MapControl/Shared/BoundingBox.cs
+++ b/MapControl/Shared/BoundingBox.cs
@@ -58,7 +58,7 @@ namespace MapControl
 
             if (values == null || values.Length != 4 && values.Length != 5)
             {
-                throw new FormatException("BoundingBox string must contain a comma-separated sequence of four or five floating point numbers.");
+                throw new FormatException($"{nameof(BoundingBox)} string must contain a comma-separated sequence of four or five floating point numbers.");
             }
 
             var rotation = values.Length == 5
diff --git a/MapControl/Shared/GeoImage.cs b/MapControl/Shared/GeoImage.cs
index 66d21165..ae7526af 100644
--- a/MapControl/Shared/GeoImage.cs
+++ b/MapControl/Shared/GeoImage.cs
@@ -165,8 +165,7 @@ namespace MapControl
                 {
                     var epsgCode = geoKeyDirectory[i + 3];
 
-                    mapProjection = MapProjectionFactory.Instance.GetProjection($"EPSG:{epsgCode}") ??
-                        throw new ArgumentException($"Can not create MapProjection \"EPSG:{epsgCode}\".");
+                    mapProjection = MapProjectionFactory.Instance.GetProjection($"EPSG:{epsgCode}");
                 }
             }
         }
diff --git a/MapControl/Shared/Location.cs b/MapControl/Shared/Location.cs
index e0e37c82..cf266838 100644
--- a/MapControl/Shared/Location.cs
+++ b/MapControl/Shared/Location.cs
@@ -66,7 +66,7 @@ namespace MapControl
 
             if (values?.Length != 2)
             {
-                throw new FormatException("Location string must contain a comma-separated pair of floating point numbers.");
+                throw new FormatException($"{nameof(Location)} string must contain a comma-separated pair of floating point numbers.");
             }
 
             return new Location(
diff --git a/MapControl/Shared/MapProjectionFactory.cs b/MapControl/Shared/MapProjectionFactory.cs
index 11b727e2..16973fd3 100644
--- a/MapControl/Shared/MapProjectionFactory.cs
+++ b/MapControl/Shared/MapProjectionFactory.cs
@@ -2,6 +2,8 @@
 // Copyright © 2024 Clemens Fischer
 // Licensed under the Microsoft Public License (Ms-PL)
 
+using System;
+
 namespace MapControl
 {
     public class MapProjectionFactory
@@ -16,48 +18,65 @@ namespace MapControl
 
         public virtual MapProjection GetProjection(string crsId)
         {
+            MapProjection projection = null;
+            
             switch (crsId)
             {
                 case WebMercatorProjection.DefaultCrsId:
-                    return new WebMercatorProjection();
+                    projection = new WebMercatorProjection();
+                    break;
 
                 case WorldMercatorProjection.DefaultCrsId:
-                    return new WorldMercatorProjection();
+                    projection = new WorldMercatorProjection();
+                    break;
 
                 case EquirectangularProjection.DefaultCrsId:
                 case "CRS:84":
                 case "EPSG:4087":
-                    return new EquirectangularProjection(crsId);
+                    projection = new EquirectangularProjection(crsId);
+                    break;
 
                 case UpsNorthProjection.DefaultCrsId:
-                    return new UpsNorthProjection();
+                    projection = new UpsNorthProjection();
+                    break;
 
                 case UpsSouthProjection.DefaultCrsId:
-                    return new UpsSouthProjection();
+                    projection = new UpsSouthProjection();
+                    break;
 
                 case Wgs84AutoUtmProjection.DefaultCrsId:
-                    return new Wgs84AutoUtmProjection();
+                    projection = new Wgs84AutoUtmProjection();
+                    break;
 
                 case OrthographicProjection.DefaultCrsId:
-                    return new OrthographicProjection();
+                    projection = new OrthographicProjection();
+                    break;
 
                 case AutoEquirectangularProjection.DefaultCrsId:
-                    return new AutoEquirectangularProjection();
+                    projection = new AutoEquirectangularProjection();
+                    break;
 
                 case GnomonicProjection.DefaultCrsId:
-                    return new GnomonicProjection();
+                    projection = new GnomonicProjection();
+                    break;
 
                 case StereographicProjection.DefaultCrsId:
-                    return new StereographicProjection();
+                    projection = new StereographicProjection();
+                    break;
 
                 case AzimuthalEquidistantProjection.DefaultCrsId:
-                    return new AzimuthalEquidistantProjection();
+                    projection = new AzimuthalEquidistantProjection();
+                    break;
 
                 default:
-                    return crsId.StartsWith("EPSG:") && int.TryParse(crsId.Substring(5), out int epsgCode)
-                        ? GetProjection(epsgCode)
-                        : null;
+                    if (crsId.StartsWith("EPSG:") && int.TryParse(crsId.Substring(5), out int epsgCode))
+                    {
+                        projection = GetProjection(epsgCode);
+                    }
+                    break;
             }
+
+            return projection ?? throw new NotSupportedException($"MapProjection \"{crsId}\" is not supported.");
         }
 
         public virtual MapProjection GetProjection(int epsgCode)
@@ -67,8 +86,8 @@ namespace MapControl
                 case var c when c >= Etrs89UtmProjection.FirstZoneEpsgCode && c <= Etrs89UtmProjection.LastZoneEpsgCode:
                     return new Etrs89UtmProjection(epsgCode % 100);
 
-                case var c when c >= Nad27UtmProjection.FirstZoneEpsgCode && c <= Nad27UtmProjection.LastZoneEpsgCode:
-                    return new Nad27UtmProjection(epsgCode % 100);
+                //case var c when c >= Nad27UtmProjection.FirstZoneEpsgCode && c <= Nad27UtmProjection.LastZoneEpsgCode:
+                //    return new Nad27UtmProjection(epsgCode % 100);
 
                 case var c when c >= Nad83UtmProjection.FirstZoneEpsgCode && c <= Nad83UtmProjection.LastZoneEpsgCode:
                     return new Nad83UtmProjection(epsgCode % 100);
diff --git a/MapUiTools/Shared/MapProjectionsMenuButton.cs b/MapUiTools/Shared/MapProjectionsMenuButton.cs
index 302e5477..e5a5bf3d 100644
--- a/MapUiTools/Shared/MapProjectionsMenuButton.cs
+++ b/MapUiTools/Shared/MapProjectionsMenuButton.cs
@@ -5,6 +5,7 @@
 using System;
 using System.Collections.ObjectModel;
 using System.Collections.Specialized;
+using System.Diagnostics;
 using System.Linq;
 #if WPF
 using System.Windows;
@@ -101,9 +102,15 @@ namespace MapControl.UiTools
         {
             if (selectedProjection != projection)
             {
-                selectedProjection = projection;
-                Map.MapProjection = MapProjectionFactory.Instance.GetProjection(selectedProjection) ??
-                    throw new ArgumentException($"Can not create MapProjection \"{selectedProjection}\".");
+                try
+                {
+                    Map.MapProjection = MapProjectionFactory.Instance.GetProjection(projection);
+                    selectedProjection = projection;
+                }
+                catch (Exception ex)
+                {
+                    Debug.WriteLine($"{nameof(MapProjectionFactory)}: {ex.Message}");
+                }
             }
 
             UpdateCheckedStates();