diff --git a/src/main/java/seng302/model/Yacht.java b/src/main/java/seng302/model/Yacht.java
index 38104e9e..d7cd1f9e 100644
--- a/src/main/java/seng302/model/Yacht.java
+++ b/src/main/java/seng302/model/Yacht.java
@@ -28,6 +28,8 @@ public class Yacht {
         void notifyLocation(Yacht yacht, double lat, double lon, double heading, double velocity);
     }
 
+    private static final Double ROUNDING_DISTANCE = 15d; // TODO: 3/08/17 wmu16 - Look into this value further
+
     //BOTH AFAIK
     private String boatType;
     private Integer sourceId;
@@ -37,9 +39,10 @@ public class Yacht {
     private String country;
 
     private Long estimateTimeAtFinish;
-    private Long timeTillNext;
-    private Double distanceToNextMark;
+    private Long lastMark;
     private Long markRoundTime;
+    private Double distanceToNextMark;
+    private Long timeTillNext;
     private CompoundMark nextMark;
     private Double heading;
     private Integer legNumber = 0;
@@ -51,6 +54,11 @@ public class Yacht {
     private GeoPoint location;
     private Integer boatStatus;
     private Double velocity;
+    //MARK ROUNDING INFO
+    private GeoPoint lastLocation;  //For purposes of mark rounding calculations
+    private Boolean hasEnteredRoundingZone; //The distance that the boat must be from the mark to round
+    private Boolean hasPassedFirstLine; //The line extrapolated from the next mark to the current mark
+    private Boolean hasPassedSecondLine; //The line extrapolated from the last mark to the current mark
 
     //CLIENT SIDE
     private List<YachtLocationListener> locationListeners = new ArrayList<>();
@@ -71,8 +79,13 @@ public class Yacht {
         this.country = country;
         this.sailIn = false;
         this.location = new GeoPoint(57.670341, 11.826856);
+        this.lastLocation = location;
         this.heading = 120.0;   //In degrees
         this.velocity = 0d;     //in mms-1
+
+        this.hasEnteredRoundingZone = false;
+        this.hasPassedFirstLine = false;
+        this.hasPassedSecondLine = false;
     }
 
     /**
@@ -108,9 +121,16 @@ public class Yacht {
             }
         }
 
-        Double metersCovered = velocity * secondsElapsed;
-        location = GeoUtility.getGeoCoordinate(location, heading, metersCovered);
+        //UPDATE BOAT LOCATION
+        location = GeoUtility.getGeoCoordinate(location, heading, velocity * secondsElapsed);
+
+        //CHECK FOR MARK ROUNDING
         distanceToNextMark = calcDistanceToNextMark();
+        if (distanceToNextMark < ROUNDING_DISTANCE) {
+            hasEnteredRoundingZone = true;
+        }
+
+        // TODO: 3/08/17 wmu16 - Implement line cross check here
     }
 
 
@@ -345,20 +365,21 @@ public class Yacht {
         return nextMark;
     }
 
-    public Double getLat() {
-        return location.getLat();
+    public GeoPoint getLocation() {
+        return location;
     }
 
-    public void setLat(Double lat) {
+    /**
+     * Sets the current location of the boat in lat and long whilst preserving the last location
+     *
+     * @param lat Latitude
+     * @param lng Longitude
+     */
+    public void setLocation(Double lat, Double lng) {
+        lastLocation.setLat(location.getLat());
+        lastLocation.setLng(location.getLng());
         location.setLat(lat);
-    }
-
-    public Double getLon() {
-        return location.getLng();
-    }
-
-    public void setLon(Double lon) {
-        location.setLng(lon);
+        location.setLng(lng);
     }
 
     public Double getHeading() {
@@ -378,10 +399,6 @@ public class Yacht {
         return boatName;
     }
 
-    public GeoPoint getLocation() {
-        return location;
-    }
-
     public void updateTimeSinceLastMarkProperty(long timeSinceLastMark) {
         this.timeSinceLastMarkProperty.set(timeSinceLastMark);
     }
@@ -416,14 +433,13 @@ public class Yacht {
         return distanceToNextMark;
     }
 
-    public void updateLocation (double lat, double lon, double heading, double velocity) {
-        location.setLat(lat);
-        location.setLng(lon);
+    public void updateLocation(double lat, double lng, double heading, double velocity) {
+        setLocation(lat, lng);
         this.heading = heading;
         this.velocity = velocity;
         updateVelocityProperty(velocity);
         for (YachtLocationListener yll : locationListeners) {
-            yll.notifyLocation(this, lat, lon, heading, velocity);
+            yll.notifyLocation(this, lat, lng, heading, velocity);
         }
     }
 
diff --git a/src/main/java/seng302/utilities/GeoUtility.java b/src/main/java/seng302/utilities/GeoUtility.java
index 54b0484a..0a49c776 100644
--- a/src/main/java/seng302/utilities/GeoUtility.java
+++ b/src/main/java/seng302/utilities/GeoUtility.java
@@ -96,8 +96,9 @@ public class GeoUtility {
 		return new GeoPoint(Math.toDegrees(endLat), Math.toDegrees(endLng));
 	}
 
-	/**
-	 * Performs the line function on two points of a line and a test point to test which side of the line that point is
+
+    /**
+     * Performs the line function on two points of a line and a test point to test which side of the line that point is
 	 * on. If the return value is
 	 * return  1, then the point is on one side of the line,
 	 * return -1 then the point is on the other side of the line
diff --git a/src/test/java/seng302/model/YachtTest.java b/src/test/java/seng302/model/YachtTest.java
index e3144a55..7937b43c 100644
--- a/src/test/java/seng302/model/YachtTest.java
+++ b/src/test/java/seng302/model/YachtTest.java
@@ -31,8 +31,7 @@ public class YachtTest {
             "HaomingIsOk",
             "NZL");
 
-        yacht.setLat(57.670333);
-        yacht.setLon(11.827833);
+        yacht.setLocation(57.670333, 11.827833);
 
         compoundMark = new CompoundMark(0, "HaomingsMark");
         Mark subMark1 = new Mark("H", 57.671524, 11.844495, 0);