Сданный вариант

ProjectCatamaran/ProjectCatamaran/BoatDelegate.cs

@@ -1,9 +0,0 @@
-using ProjectCatamaran.Drawnings;
-
-namespace ProjectCatamaran;
-
-/// <summary>
-/// Делегат передачи объекта класса-прорисовки
-/// </summary>
-/// <param name="car"></param>
-public delegate void BoatDelegate(DrawningBoat boat);

ProjectCatamaran/ProjectCatamaran/FormBoatConfig.cs

@@ -7,7 +7,7 @@ public partial class FormBoatConfig : Form
 {
     private DrawningBoat? _boat = null;
 
-    private event BoatDelegate? _boatDelegate;
+    private event Action<DrawningBoat>? _boatDelegate;
     public FormBoatConfig()
     {
         InitializeComponent();
@@ -28,7 +28,7 @@ public partial class FormBoatConfig : Form
 	/// Привязка внешнего метода к событию
 	/// </summary>
 	/// <param name="carDelegate"></param>
-	public void AddEvent(BoatDelegate boatDelegate)
+	public void AddEvent(Action<DrawningBoat> boatDelegate)
     {
         _boatDelegate += boatDelegate;
     }