Add custom behavior to map

I try to add custom behavior using javascript but I can't.
my code is

jQuery(document).ready(function() {
	var map = Drupal.gmap.getMap('map-id');
    Drupal.gmap.addHandler('gmap', function() {	  
	  this.bind("move", function () {
	     //code
	  });
  });
});

Best Regards