diff --git a/racevisionGame/src/main/java/mock/model/MockBoat.java b/racevisionGame/src/main/java/mock/model/MockBoat.java
index 227dfe54..b6cd7a24 100644
--- a/racevisionGame/src/main/java/mock/model/MockBoat.java
+++ b/racevisionGame/src/main/java/mock/model/MockBoat.java
@@ -1,8 +1,5 @@
 package mock.model;
 
-
-import mock.model.collider.Collider;
-import mock.model.collider.Collision;
 import shared.model.*;
 
 
@@ -10,7 +7,7 @@ import shared.model.*;
  * Represents a Boat on the mock side of a race.
  * This adds mock specific functionality to a boat.
  */
-public class MockBoat extends Boat implements Collider {
+public class MockBoat extends Boat {
 
 
     /**
@@ -303,28 +300,4 @@ public class MockBoat extends Boat implements Collider {
     public void setAutoVMG(boolean autoVMG) {
         this.autoVMG = autoVMG;
     }
-
-    @Override
-    public boolean rayCast(MockBoat boat, double distance) {
-        double actualDistance = GPSCoordinate.calculateDistanceMeters(boat.getPosition(), this.getPosition());
-        Bearing absolute = GPSCoordinate.calculateBearing(boat.getPosition(), this.getPosition());
-        Bearing relative = Bearing.fromDegrees(absolute.degrees() - boat.getBearing().degrees());
-
-        if(actualDistance <= distance) {
-            onCollisionEnter(new Collision(relative, actualDistance));
-            return true;
-        } else return false;
-    }
-
-    @Override
-    public boolean rayCast(MockBoat boat) {
-        if(boat != this) {
-            return rayCast(boat, 100);
-        } else return false;
-    }
-
-    @Override
-    public void onCollisionEnter(Collision e) {
-        System.out.println(e.getBearing().degrees());
-    }
 }
diff --git a/racevisionGame/src/main/java/mock/model/collider/Collider.java b/racevisionGame/src/main/java/mock/model/collider/Collider.java
index c7a2fa51..967af804 100644
--- a/racevisionGame/src/main/java/mock/model/collider/Collider.java
+++ b/racevisionGame/src/main/java/mock/model/collider/Collider.java
@@ -1,29 +1,43 @@
 package mock.model.collider;
 
-import mock.model.MockBoat;
+import shared.model.Bearing;
+import shared.model.Boat;
+import shared.model.GPSCoordinate;
+import shared.model.Locatable;
 
 /**
  * Interface for all objects sensitive to collision in a race.
  */
-public interface Collider {
+public abstract class Collider implements Locatable {
     /**
      * Indicates whether a ray cast from a boat to a target collider is within the specified length.
      * @param boat potentially colliding with target
      * @param distance distance for valid collision
      * @return whether or not a collision has occurred
      */
-    boolean rayCast(MockBoat boat, double distance);
+    public boolean rayCast(Boat boat, double distance) {
+        double actualDistance = GPSCoordinate.calculateDistanceMeters(boat.getPosition(), this.getPosition());
+        // Compass direction of collider
+        Bearing absolute = Bearing.fromAzimuth(GPSCoordinate.calculateAzimuth(boat.getPosition(), this.getPosition()));
+        // Direction of collider from heading
+        Bearing relative = Bearing.fromDegrees(absolute.degrees() - boat.getBearing().degrees());
+
+        if(actualDistance <= distance) {
+            onCollisionEnter(new Collision(relative, distance));
+            return true;
+        } else return false;
+    }
 
     /**
      * Indicates whether a ray cast from a boat to a target collider triggers a collision. Distance is set by the object.
      * @param boat potentially colliding with target
      * @return whether or not a collision has occurred
      */
-    boolean rayCast(MockBoat boat);
+    public abstract boolean rayCast(Boat boat);
 
     /**
      * Handle a collision event
      * @param e details of collision
      */
-    void onCollisionEnter(Collision e);
+    public abstract void onCollisionEnter(Collision e);
 }
diff --git a/racevisionGame/src/main/java/mock/model/collider/ColliderRegistry.java b/racevisionGame/src/main/java/mock/model/collider/ColliderRegistry.java
index 7127b75c..efc0caa5 100644
--- a/racevisionGame/src/main/java/mock/model/collider/ColliderRegistry.java
+++ b/racevisionGame/src/main/java/mock/model/collider/ColliderRegistry.java
@@ -1,6 +1,7 @@
 package mock.model.collider;
 
-import mock.model.MockBoat;
+import shared.model.Boat;
+import shared.model.GPSCoordinate;
 
 import java.util.ArrayList;
 import java.util.Collection;
@@ -9,7 +10,7 @@ import java.util.List;
 /**
  * Registry for all Collider objects in a MockRace. Wraps the Collider interface as part of a Composite Pattern.
  */
-public class ColliderRegistry implements Collider {
+public class ColliderRegistry extends Collider {
     /**
      * List of all registered Colliders
      */
@@ -26,21 +27,12 @@ public class ColliderRegistry implements Collider {
         colliders.add(collider);
     }
 
-    public void removeCollider(Collider collider) {
-        colliders.remove(collider);
-    }
-
     public void addAllColliders(Collection<? extends Collider> colliders) {
         for(Collider collider: colliders) addCollider(collider);
     }
 
     @Override
-    public boolean rayCast(MockBoat boat, double distance) {
-        return false;
-    }
-
-    @Override
-    public boolean rayCast(MockBoat boat) {
+    public boolean rayCast(Boat boat) {
         for(Collider collider: colliders) {
             if(collider.rayCast(boat)) return true;
         }
@@ -49,4 +41,14 @@ public class ColliderRegistry implements Collider {
 
     @Override
     public void onCollisionEnter(Collision e) {}
+
+    @Override
+    public GPSCoordinate getPosition() {
+        return null;
+    }
+
+    @Override
+    public void setPosition(GPSCoordinate position) {
+
+    }
 }
diff --git a/racevisionGame/src/main/java/shared/model/Boat.java b/racevisionGame/src/main/java/shared/model/Boat.java
index 9d1d0c40..16ec08b9 100644
--- a/racevisionGame/src/main/java/shared/model/Boat.java
+++ b/racevisionGame/src/main/java/shared/model/Boat.java
@@ -2,6 +2,8 @@ package shared.model;
 
 
 import javafx.beans.property.*;
+import mock.model.collider.Collider;
+import mock.model.collider.Collision;
 import network.Messages.Enums.BoatStatusEnum;
 import org.jetbrains.annotations.Nullable;
 
@@ -10,7 +12,7 @@ import java.time.ZonedDateTime;
 /**
  * Boat Model that is used to store information on the boats that are running in the race.
  */
-public class Boat implements Locatable {
+public class Boat extends Collider {
     /**
      * The name of the boat/team.
      */
@@ -390,4 +392,15 @@ public class Boat implements Locatable {
         this.timeAtLastMark = timeAtLastMark;
     }
 
+    @Override
+    public boolean rayCast(Boat boat) {
+        if(boat != this) {
+            return rayCast(boat, 100);
+        } else return false;
+    }
+
+    @Override
+    public void onCollisionEnter(Collision e) {
+        System.out.println(e.getBearing().degrees());
+    }
 }
diff --git a/racevisionGame/src/main/java/shared/model/Mark.java b/racevisionGame/src/main/java/shared/model/Mark.java
index 1dddeea8..149713be 100644
--- a/racevisionGame/src/main/java/shared/model/Mark.java
+++ b/racevisionGame/src/main/java/shared/model/Mark.java
@@ -1,6 +1,5 @@
 package shared.model;
 
-import mock.model.MockBoat;
 import mock.model.collider.Collider;
 import mock.model.collider.Collision;
 
@@ -8,7 +7,7 @@ import mock.model.collider.Collision;
  * Represents an individual mark.
  * Has a source ID, name, and position.
  */
-public class Mark implements Locatable, Collider {
+public class Mark extends Collider {
 
     /**
      * The source ID of the mark.
@@ -81,21 +80,7 @@ public class Mark implements Locatable, Collider {
     }
 
     @Override
-    public boolean rayCast(MockBoat boat, double distance) {
-        double actualDistance = GPSCoordinate.calculateDistanceMeters(boat.getPosition(), this.position);
-        // Compass direction of collider
-        Bearing absolute = Bearing.fromAzimuth(GPSCoordinate.calculateAzimuth(boat.getPosition(), this.position));
-        // Direction of collider from heading
-        Bearing relative = Bearing.fromDegrees(absolute.degrees() - boat.getBearing().degrees());
-
-        if(actualDistance <= distance) {
-            onCollisionEnter(new Collision(relative, distance));
-            return true;
-        } else return false;
-    }
-
-    @Override
-    public boolean rayCast(MockBoat boat) {
+    public boolean rayCast(Boat boat) {
         return rayCast(boat, 100);
     }
 
diff --git a/racevisionGame/src/test/java/mock/model/MockBoatTest.java b/racevisionGame/src/test/java/mock/model/MockBoatTest.java
index dcc17f1b..8d1f45ee 100644
--- a/racevisionGame/src/test/java/mock/model/MockBoatTest.java
+++ b/racevisionGame/src/test/java/mock/model/MockBoatTest.java
@@ -3,7 +3,6 @@ package mock.model;
 import org.junit.Before;
 import org.junit.Test;
 import shared.model.Bearing;
-import shared.model.CompoundMark;
 import shared.model.GPSCoordinate;
 import shared.model.Mark;