diff --git a/MapControl/Shared/AutoEquirectangularProjection.cs b/MapControl/Shared/AutoEquirectangularProjection.cs
index 1ba7f033..de9dfe92 100644
--- a/MapControl/Shared/AutoEquirectangularProjection.cs
+++ b/MapControl/Shared/AutoEquirectangularProjection.cs
@@ -9,6 +9,11 @@ using System.Windows;
 
 namespace MapControl
 {
+    /// <summary>
+    /// Auto-Equirectangular Projection - AUTO2:42004.
+    /// Equidistant cylindrical projection with standard parallel and central meridian set by the Center property.
+    /// See "Map Projections - A Working Manual" (https://pubs.usgs.gov/pp/1395/report.pdf), p.90-91.
+    /// </summary>
     public class AutoEquirectangularProjection : MapProjection
     {
         public const string DefaultCrsId = "AUTO2:42004";
@@ -16,24 +21,21 @@ namespace MapControl
         public AutoEquirectangularProjection()
         {
             CrsId = DefaultCrsId;
+            IsNormalCylindrical = true;
         }
 
         public override Point LocationToMap(Location location)
         {
-            var xScale = Wgs84MetersPerDegree * Math.Cos(Center.Latitude * Math.PI / 180d);
-
             return new Point(
-                xScale * (location.Longitude - Center.Longitude),
+                Wgs84MetersPerDegree * (location.Longitude - Center.Longitude) * Math.Cos(Center.Latitude * Math.PI / 180d),
                 Wgs84MetersPerDegree * location.Latitude);
         }
 
         public override Location MapToLocation(Point point)
         {
-            var xScale = Wgs84MetersPerDegree * Math.Cos(Center.Latitude * Math.PI / 180d);
-
             return new Location(
                 point.Y / Wgs84MetersPerDegree,
-                point.X / xScale + Center.Longitude);
+                point.X / (Wgs84MetersPerDegree * Math.Cos(Center.Latitude * Math.PI / 180d)) + Center.Longitude);
         }
     }
 }
diff --git a/MapControl/Shared/AzimuthalEquidistantProjection.cs b/MapControl/Shared/AzimuthalEquidistantProjection.cs
index bd03eefe..5e0953d9 100644
--- a/MapControl/Shared/AzimuthalEquidistantProjection.cs
+++ b/MapControl/Shared/AzimuthalEquidistantProjection.cs
@@ -10,12 +10,11 @@ using System.Windows;
 namespace MapControl
 {
     /// <summary>
-    /// Spherical Azimuthal Equidistant Projection.
+    /// Spherical Azimuthal Equidistant Projection - No standard CRS ID.
+    /// See "Map Projections - A Working Manual" (https://pubs.usgs.gov/pp/1395/report.pdf), p.195-197.
     /// </summary>
     public class AzimuthalEquidistantProjection : AzimuthalProjection
     {
-        // No standard CRS ID
-
         public override Point LocationToMap(Location location)
         {
             if (location.Equals(Center))
diff --git a/MapControl/Shared/EquirectangularProjection.cs b/MapControl/Shared/EquirectangularProjection.cs
index 39469fba..a2bd0be0 100644
--- a/MapControl/Shared/EquirectangularProjection.cs
+++ b/MapControl/Shared/EquirectangularProjection.cs
@@ -13,8 +13,9 @@ using System.Windows;
 namespace MapControl
 {
     /// <summary>
-    /// Equirectangular Projection.
-    /// Longitude and Latitude values are transformed linearly to X and Y values in meters.
+    /// Equirectangular Projection - EPSG:4326.
+    /// Equidistant cylindrical projection with zero standard parallel and central meridian.
+    /// See "Map Projections - A Working Manual" (https://pubs.usgs.gov/pp/1395/report.pdf), p.90-91.
     /// </summary>
     public class EquirectangularProjection : MapProjection
     {
diff --git a/MapControl/Shared/GnomonicProjection.cs b/MapControl/Shared/GnomonicProjection.cs
index feb8ac9e..20b5f963 100644
--- a/MapControl/Shared/GnomonicProjection.cs
+++ b/MapControl/Shared/GnomonicProjection.cs
@@ -10,7 +10,8 @@ using System.Windows;
 namespace MapControl
 {
     /// <summary>
-    /// Spherical Gnomonic Projection.
+    /// Spherical Gnomonic Projection - AUTO2:97001.
+    /// See "Map Projections - A Working Manual" (https://pubs.usgs.gov/pp/1395/report.pdf), p.165-167.
     /// </summary>
     public class GnomonicProjection : AzimuthalProjection
     {
diff --git a/MapControl/Shared/OrthographicProjection.cs b/MapControl/Shared/OrthographicProjection.cs
index bad81d2f..ca1b46ec 100644
--- a/MapControl/Shared/OrthographicProjection.cs
+++ b/MapControl/Shared/OrthographicProjection.cs
@@ -10,7 +10,8 @@ using System.Windows;
 namespace MapControl
 {
     /// <summary>
-    /// Spherical Orthographic Projection.
+    /// Spherical Orthographic Projection - AUTO2:42003.
+    /// See "Map Projections - A Working Manual" (https://pubs.usgs.gov/pp/1395/report.pdf), p.148-150.
     /// </summary>
     public class OrthographicProjection : AzimuthalProjection
     {
diff --git a/MapControl/Shared/StereographicProjection.cs b/MapControl/Shared/StereographicProjection.cs
index 8d5683db..32baff7a 100644
--- a/MapControl/Shared/StereographicProjection.cs
+++ b/MapControl/Shared/StereographicProjection.cs
@@ -10,7 +10,8 @@ using System.Windows;
 namespace MapControl
 {
     /// <summary>
-    /// Spherical Stereographic Projection.
+    /// Spherical Stereographic Projection - AUTO2:97002.
+    /// See "Map Projections - A Working Manual" (https://pubs.usgs.gov/pp/1395/report.pdf), p.157-160.
     /// </summary>
     public class StereographicProjection : AzimuthalProjection
     {
diff --git a/MapControl/Shared/WebMercatorProjection.cs b/MapControl/Shared/WebMercatorProjection.cs
index 5fd7bf4b..234fb7ab 100644
--- a/MapControl/Shared/WebMercatorProjection.cs
+++ b/MapControl/Shared/WebMercatorProjection.cs
@@ -10,7 +10,7 @@ using System.Windows;
 namespace MapControl
 {
     /// <summary>
-    /// Spherical Mercator Projection, EPSG:3857.
+    /// Spherical Mercator Projection - EPSG:3857.
     /// See "Map Projections - A Working Manual" (https://pubs.usgs.gov/pp/1395/report.pdf), p.41-44.
     /// </summary>
     public class WebMercatorProjection : MapProjection
diff --git a/MapControl/Shared/WorldMercatorProjection.cs b/MapControl/Shared/WorldMercatorProjection.cs
index 6592bb45..abdc71f2 100644
--- a/MapControl/Shared/WorldMercatorProjection.cs
+++ b/MapControl/Shared/WorldMercatorProjection.cs
@@ -10,7 +10,7 @@ using System.Windows;
 namespace MapControl
 {
     /// <summary>
-    /// Elliptical Mercator Projection, EPSG:3395.
+    /// Elliptical Mercator Projection - EPSG:3395.
     /// See "Map Projections - A Working Manual" (https://pubs.usgs.gov/pp/1395/report.pdf), p.44-45.
     /// </summary>
     public class WorldMercatorProjection : MapProjection
diff --git a/MapProjections/Shared/PolarStereographicProjection.cs b/MapProjections/Shared/PolarStereographicProjection.cs
index c2a6b438..33dead12 100644
--- a/MapProjections/Shared/PolarStereographicProjection.cs
+++ b/MapProjections/Shared/PolarStereographicProjection.cs
@@ -112,6 +112,9 @@ namespace MapControl.Projections
         }
     }
 
+    /// <summary>
+    /// Elliptical North Polar Stereographic Projection - EPSG:32661.
+    /// </summary>
     public class UpsNorthProjection : PolarStereographicProjection
     {
         public const string DefaultCrsId = "EPSG:32661";
@@ -122,6 +125,9 @@ namespace MapControl.Projections
         }
     }
 
+    /// <summary>
+    /// Elliptical South Polar Stereographic Projection - EPSG:32761.
+    /// </summary>
     public class UpsSouthProjection : PolarStereographicProjection
     {
         public const string DefaultCrsId = "EPSG:32761";