diff --git a/racevisionGame/src/main/java/mock/model/RaceLogic.java b/racevisionGame/src/main/java/mock/model/RaceLogic.java
index 7c2e6dd3..a3560bbd 100644
--- a/racevisionGame/src/main/java/mock/model/RaceLogic.java
+++ b/racevisionGame/src/main/java/mock/model/RaceLogic.java
@@ -1,6 +1,8 @@
 package mock.model;
 
 import javafx.animation.AnimationTimer;
+import mock.model.collider.Collision;
+import mock.model.commandFactory.Command;
 import mock.model.commandFactory.CompositeCommand;
 import mock.model.commandFactory.CommandFactory;
 import network.Messages.Enums.BoatActionEnum;
@@ -9,8 +11,11 @@ import network.Messages.Enums.RaceStatusEnum;
 import network.Messages.LatestMessages;
 import shared.model.RunnableWithFramePeriod;
 
+import java.util.Observable;
+import java.util.Observer;
 
-public class RaceLogic implements RunnableWithFramePeriod {
+
+public class RaceLogic implements RunnableWithFramePeriod, Observer {
     /**
      * State of current race modified by this object
      */
@@ -32,6 +37,8 @@ public class RaceLogic implements RunnableWithFramePeriod {
         this.race = race;
         this.server = new RaceServer(race, messages);
         this.commands = compositeCommand;
+
+        race.getColliderRegistry().addObserver(this);
     }
 
     /**
@@ -168,4 +175,14 @@ public class RaceLogic implements RunnableWithFramePeriod {
     public MockRace getRace() {
         return race;
     }
+
+    @Override
+    public void update(Observable o, Object arg) {
+        Collision e = (Collision)arg;
+
+        if(e.getBearing().degrees() == 0) System.out.println("Ahead");
+        else if(e.getBearing().degrees() < 90) System.out.println("Starboard");
+        else if(e.getBearing().degrees() > 270) System.out.println("Port");
+        else System.out.println("Behind");
+    }
 }
diff --git a/racevisionGame/src/main/java/mock/model/collider/Collider.java b/racevisionGame/src/main/java/mock/model/collider/Collider.java
index 967af804..32fb25eb 100644
--- a/racevisionGame/src/main/java/mock/model/collider/Collider.java
+++ b/racevisionGame/src/main/java/mock/model/collider/Collider.java
@@ -5,10 +5,12 @@ import shared.model.Boat;
 import shared.model.GPSCoordinate;
 import shared.model.Locatable;
 
+import java.util.Observable;
+
 /**
  * Interface for all objects sensitive to collision in a race.
  */
-public abstract class Collider implements Locatable {
+public abstract class Collider extends Observable 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
@@ -23,7 +25,13 @@ public abstract class Collider implements Locatable {
         Bearing relative = Bearing.fromDegrees(absolute.degrees() - boat.getBearing().degrees());
 
         if(actualDistance <= distance) {
-            onCollisionEnter(new Collision(relative, distance));
+            Collision collision = new Collision(relative, distance);
+            // Notify object of collision
+            onCollisionEnter(collision);
+            // Notify observers of collision
+            notifyObservers(collision);
+            this.setChanged();
+
             return true;
         } else return false;
     }
diff --git a/racevisionGame/src/main/java/mock/model/collider/ColliderRegistry.java b/racevisionGame/src/main/java/mock/model/collider/ColliderRegistry.java
index efc0caa5..746b9fa4 100644
--- a/racevisionGame/src/main/java/mock/model/collider/ColliderRegistry.java
+++ b/racevisionGame/src/main/java/mock/model/collider/ColliderRegistry.java
@@ -3,14 +3,12 @@ package mock.model.collider;
 import shared.model.Boat;
 import shared.model.GPSCoordinate;
 
-import java.util.ArrayList;
-import java.util.Collection;
-import java.util.List;
+import java.util.*;
 
 /**
  * Registry for all Collider objects in a MockRace. Wraps the Collider interface as part of a Composite Pattern.
  */
-public class ColliderRegistry extends Collider {
+public class ColliderRegistry extends Collider implements Observer {
     /**
      * List of all registered Colliders
      */
@@ -24,6 +22,7 @@ public class ColliderRegistry extends Collider {
     }
 
     public void addCollider(Collider collider) {
+        collider.addObserver(this);
         colliders.add(collider);
     }
 
@@ -51,4 +50,17 @@ public class ColliderRegistry extends Collider {
     public void setPosition(GPSCoordinate position) {
 
     }
+
+    /**
+     * Fire onCollisionEnter when collision bubbles up from registered colliders.
+     * @param o object collided with
+     * @param arg parameters of the collision
+     */
+    @Override
+    public void update(Observable o, Object arg) {
+        Collision collision = (Collision)arg;
+
+        notifyObservers(collision);
+        this.setChanged();
+    }
 }
diff --git a/racevisionGame/src/main/java/shared/model/Boat.java b/racevisionGame/src/main/java/shared/model/Boat.java
index 16ec08b9..7aff1222 100644
--- a/racevisionGame/src/main/java/shared/model/Boat.java
+++ b/racevisionGame/src/main/java/shared/model/Boat.java
@@ -401,6 +401,5 @@ public class Boat extends Collider {
 
     @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 149713be..aa123aff 100644
--- a/racevisionGame/src/main/java/shared/model/Mark.java
+++ b/racevisionGame/src/main/java/shared/model/Mark.java
@@ -86,9 +86,5 @@ public class Mark extends Collider {
 
     @Override
     public void onCollisionEnter(Collision e) {
-        if(e.getBearing().degrees() == 0) System.out.println("Ahead");
-        else if(e.getBearing().degrees() < 90) System.out.println("Starboard");
-        else if(e.getBearing().degrees() > 270) System.out.println("Port");
-        else System.out.println("Behind");
     }
 }