/** Make the Robot navigate to the closest node to the basket, then process to defend. */
  public void start() {
    navigator.defineRestrictions(true);

    // node 69 should be the tile just in front of basket
    navigator.travelPath(navigator.searchNode(69));
    robotCtrl.turnTo(90);
    robotCtrl.goToIntersect();
    robotCtrl.turn(180);
    deployMechanism();
    robotCtrl.goBackward(25);
  }
 // constructors
 public OdometerCorrection_v1(
     RobotCtrl robotCtrl,
     LineSensor lineSensorL,
     LineSensor lineSensorR,
     int odoCorrectionRefresh) {
   this.robotCtrl = robotCtrl;
   this.odometer = robotCtrl.getOdometer();
   this.lineSensorL = lineSensorL;
   this.lineSensorR = lineSensorR;
   this.odoCorrectionTimer = new Timer(odoCorrectionRefresh, this);
 }