Changed distance calculation to use latitude and longitude

Tags: #fix

src/test/java/seng302/EventTest.java

@@ -33,6 +33,6 @@ public class EventTest {
         Boat boat = new Boat("testBoat");
         Event event = new Event(1231242.2, boat, new Mark("mark1", 142.5, 122.1), new Mark("mark2", 121.9,99.2));
 
-        assertEquals(event.getDistanceBetweenMarks(), 30.80211031731429, 1e-15);
+        assertEquals(event.getDistanceBetweenMarks(), 339059.653830461, 1e-15);
     }
 }