instruments.setLayout(new BoxLayout(instruments, BoxLayout.X_AXIS));
compass = new AirCompass();
compass.setSize(SIZE);
instruments.add(compass);
// Altimeter
altimeter = new Altimeter();
altimeter.setSize(SIZE);
altimeter.setUnitString("mt");
altimeter.setLcdUnitString("mt");
altimeter.setLcdDecimals(2);
instruments.add(altimeter);