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Re:Show HN: A vintage London map app that you can annotate a... by CatsoCatsoCatso on Friday July 24, 2015 @11:01AM (#9942438)
It might be hard work..

This link is a good jumping off point though (see blog post linked in answer)

http://stackoverflow.com/questions/13638969/using-custom-map...

Re:Show HN: A vintage London map app that you can annotate a... by taigeair on Friday July 24, 2015 @05:40PM (#9945362)
Thanks catso :)