I have a problem with the in app purchase. How do I contact the developer?

If you lose your in-app purchases because Galileo Offline Maps was reinstalled (or you want to transfer it to another your IOS device), you may be able to restore it for free.
To activate them again, simply select "restore" option at the top right corner on More Features screen within the installed app and use the same Apple ID account name as for the original in-app purchase.