You're in Europe, you are protected. The database is copyrighted whilst the data isn't itself copyrightable. It is when the act of compiling the data is non-trivial and you can show that the data has resulted from this process (which you appear to be able to given that you have used names and entered routes in a way specific to your process) that you are covered.

I'd start off with talking to him. His website http://www.philipkirwan.ie/site/index.html states that he's doing an undergrad at Dublin City University, which no doubt includes lessons in the social aspect of computing including Copyright, Patents and Data Protection, etc.

My points: He will be well aware of copyright, and the institution really does not want to bring itself into disrepute as a result of the actions of their students. It would not do his study well at all to provable have stolen the work of someone else having been made very well aware of copyright during prior study. The question raised, "Is all of Philip Kirwin's work his own work?". And that for a university, and for Philip himself is a very big deal.

So I'd simply appeal to his own sense of self-preservation in that if he has indeed (as it appears) taken the content from your work and passed it off as his own then he is playing with fire that will burn him far greater than just losing the right to sell one iPhone application.

At this point, he's already potentially damaged his reputation through his actions, now it is up to him to determine whether he wants to salvage this or risk burning himself totally.