code: @Pure
  	public static double getPreferredRadius() {
  		final Preferences prefs = Preferences.userNodeForPackage(MapElementConstants.class);
  		if (prefs != null) {
  			return prefs.getDouble("RADIUS", DEFAULT_RADIUS); //$NON-NLS-1$
  		}
  		return DEFAULT_RADIUS;
  	}
docs: Replies the default radius for map elements.
  
  @return the default radius for map elements.