All code for the maps lives in assets/js/map.js. Note that in the contact page, location page and any other page that has a map will include custom style sheets and scripts. Those files are linked under Page Specific Scripts & Styles before the end of the body tag and in the head.
To change the coordinates for your map, you can either edit the data attributes in the map’s div:
div id="map1" data-lat="51.5" data-lng="-0.09" class="ct-contact-map"
a href="https://maps.google.com/?q=51.5,-0.09" target="_blank" class="btn-custom shadow-none">View in Google Maps
As you can see you have two data attributes: data-lat and data-lng. Change them respectively.
Alternatively you can change the coordinates for your contact page or any other page which has only 1 map Not the Locations page. By changing the variable values in map.js