• If possible, add correct, unitless width and height attributes to your image map images. You can override these in CSS to make them responsive.
• Add a link to jQuery in your page, preferably at the bottom just before the closing </body>
• After jQuery, either in a <script> block or a separate file, call:

$('img[usemap]').rwdImageMaps();

You may also want to wrap it inside a $(document).ready() function, like so:

$(document).ready(function(e) {
    $('img[usemap]').rwdImageMaps();
});

http://mattstow.com/experiment/responsive-image-maps/rwd-image-maps.html

Copyright (c) 2016 Matt Stow
Licensed under the MIT license (see LICENSE for details)
Minified version created with Online YUI Compressor: http://www.refresh-sf.com/yui/