public class RepairDroid
{
    public static final String INITIAL_INPUT = "";

    public RepairDroid (Vector<String> instructions, boolean debug)
    {
        _debug = debug;
        _theComputer = new Intcode(instructions, INITIAL_INPUT, _debug);
        _location = new Coordinate(0, 0);
    }

    public final int moveToOxygenStation ()
    {
        int numberOfSteps = 0;

        return numberOfSteps;
    }

    public void printGrid ()
    {
        
    }

    private boolean _debug;
    private Intcode _theComputer;
    private Coordinate _location;
}
@@ -285,16 +285,113 @@
 (0, 0);%0A
+        _visitedLocations = new Vector%3CCoordinate%3E();%0A%0A        _visitedLocations.add(_location);%0A
     %7D%0A%0A 
@@ -655,9 +655,59 @@
 cation;%0A
+    private Vector%3CCoordinate%3E _visitedLocations;%0A
 %7D

Update RepairDroid.java