I clicked the 'GPS' button on the map page of my OptiSurface Cloud link and I get the message: 'Location Information is unavailable.'
Unfortunately Access to Location services has been removed from non secure web sites by Apple in IOS 10. To use them the web page has to come from an 'https:' url. We are working on fixing this problem.
If you are not using Apple's IOS10 and above and wish to use the GPS for a moving map display, make sure you have your GPS available to your web browser.
E.g. iPhone Settings > Privacy > Location Services > ON & iPhone Settings > Privacy > Location Services > Safari Websites > While Using The App.
If you are having problems viewing the map Designs, make sure you do not have you web browser in Private Browser Mode. See this link: OptiSurface Cloud Link Not Working
P.S. Ipads and many Android Tablets do not have GPS built-in so this may not work. Most smart phones have GPS and are better.