Hi,
as kentico_janh said, we do not have support for geolocation, but I believe that it would not be that hard to implement your own solution (e.g. your own webpart). I would like to just add link to
HTML5 Geolocation API . As you can see the API is pretty easy to use and there is plenty of online APIs to use to get more user friendly data than latitude and longitude is (e.g. map, address, street).
Also please consider that HTML5 Geolocation is rather new feature, so older browsers might not support it, so please do not forget that you still should provide some fallback option for users of old browsers. Other thing I would like to warn you about is that user must give his consent to use HTML5 Geolocation. What I want to say is that HTML5 Geolocation is neat API and it can simplify things a lot, but if you are building some key feature on your web, you should not rely solely on it.
Since HTML5 Geolocation API can be used for many purposes I would like to ask you to give us some further information about what you want to achieve and post it on our
uservoice so we can consider your request and implement it, or at least give your better support for your solution.