diff --git a/MapControl/Shared/AzimuthalEquidistantProjection.cs b/MapControl/Shared/AzimuthalEquidistantProjection.cs
index 1c98c1cc..fc08d8b2 100644
--- a/MapControl/Shared/AzimuthalEquidistantProjection.cs
+++ b/MapControl/Shared/AzimuthalEquidistantProjection.cs
@@ -9,12 +9,12 @@ using Avalonia;
 namespace MapControl
 {
     /// <summary>
-    /// Spherical Azimuthal Equidistant Projection - No standard CRS identifier.
+    /// Spherical Azimuthal Equidistant Projection - AUTO2:97003.
     /// See "Map Projections - A Working Manual" (https://pubs.usgs.gov/publication/pp1395), p.195-197.
     /// </summary>
     public class AzimuthalEquidistantProjection : AzimuthalProjection
     {
-        public const string DefaultCrsId = "AUTO2:97003"; // proprietary CRS identifier
+        public const string DefaultCrsId = "AUTO2:97003"; // GeoServer non-standard CRS identifier
 
         public AzimuthalEquidistantProjection() // parameterless constructor for XAML
             : this(DefaultCrsId)
diff --git a/MapProjections/Shared/ProjNetMapProjection.cs b/MapProjections/Shared/ProjNetMapProjection.cs
index 0342051c..61691ed8 100644
--- a/MapProjections/Shared/ProjNetMapProjection.cs
+++ b/MapProjections/Shared/ProjNetMapProjection.cs
@@ -49,9 +49,7 @@ namespace MapControl.Projections
                 var name = field.Projection?.Name ??
                     throw new ArgumentException("CoordinateSystem.Projection must not be null.", nameof(value));
 
-                IsNormalCylindrical = name.StartsWith("Mercator") ||
-                    name.StartsWith("Equirectangular") ||
-                    name.Contains("Pseudo-Mercator");
+                IsNormalCylindrical = name.StartsWith("Mercator") || name.Contains("Pseudo-Mercator");
 
                 var transformFactory = new CoordinateTransformationFactory();
 
diff --git a/MapProjections/Shared/Wgs84OrthographicProjection.cs b/MapProjections/Shared/Wgs84OrthographicProjection.cs
index 6d608c81..abcdf22f 100644
--- a/MapProjections/Shared/Wgs84OrthographicProjection.cs
+++ b/MapProjections/Shared/Wgs84OrthographicProjection.cs
@@ -1,5 +1,4 @@
-using System;
-using System.Globalization;
+using System.Globalization;
 #if WPF
 using System.Windows.Media;
 #endif
@@ -38,11 +37,8 @@ namespace MapControl.Projections
         public override Matrix RelativeScale(double latitude, double longitude)
         {
             var p = new AzimuthalProjection.ProjectedPoint(Center.Latitude, Center.Longitude, latitude, longitude);
-            var h = p.CosC; // p.149 (20-5)
 
-            var scale = new Matrix(h, 0d, 0d, 1d, 0d, 0d);
-            scale.Rotate(-Math.Atan2(p.Y, p.X) * 180d / Math.PI);
-            return scale;
+            return p.RelativeScale(p.CosC, 1d); // p.149 (20-5), k == 1
         }
     }
 }
diff --git a/MapProjections/Shared/Wgs84StereographicProjection.cs b/MapProjections/Shared/Wgs84StereographicProjection.cs
index 821fa195..4f1cc8ae 100644
--- a/MapProjections/Shared/Wgs84StereographicProjection.cs
+++ b/MapProjections/Shared/Wgs84StereographicProjection.cs
@@ -39,7 +39,7 @@ namespace MapControl.Projections
             var p = new AzimuthalProjection.ProjectedPoint(Center.Latitude, Center.Longitude, latitude, longitude);
             var k = 2d / (1d + p.CosC); // p.157 (21-4), k0 == 1
 
-            return new Matrix(k, 0d, 0d, k, 0d, 0d);
+            return p.RelativeScale(k, k);
         }
     }
 }