Game of Thrones is now on its fourth season, with five and six in the offing; the books the show is based on meanwhile are heading towards their seventh edition. And with the ever expanding and more detailed fantasy world it depicts, it helps to have a map to visualise where exactly the latest bout of bloodshed is going down.

In 2012 one fan, serMountainGoat, took it upon themselves to create their own map of the A Song of Ice and Fire series – and won praise from the books' writer George R.R. Martin, who said: "This is a very handsome map. And based on the information you have, it's quite good."

Now on the website quartermaester.info, the map has been blended with the Google Maps API to create an interactive version, where you can follow the routes that the various characters take throughout the saga. A little like the infamous map that showed the areas of London that different gangs operated in, you can see where the different constituencies of Westeros begin and end, as well as where each of the noblemen and women live – each has a clickthrough link to the Wiki of Ice and Fire database for more information.

Best of all, a slider allows you to show information only as far as the chapter or episode you've reached, meaning that the map can remain blissfully spoiler free. It joins other Game of Thrones mapping projects outlined on the Google Map Mania blog, from the general to the specific, including one that plots the journey of Arya Stark.

But it might not remain fit for purpose as the series continues to unfold. As Martin also said of serMountainGoat's map, "there's lots of information you don't have, so it's not accurate. There are certain things — the geography and location of the Summer Islands, the placement of Qarth and the Jade Gates, everything east of Slaver's Bay and the Dothraki Sea... that you would have no way of knowing." It differs somewhat from the more extensive official map, published later in 2012 by illustrator and cartographer Jonathan Roberts – which itself is headed as 'The Known World'.