Looking for interesting free or low priced books is really hurting me. It takes me away from reading now, those that I truly need. If I am not careful, it is an entry into a poverty trap!
I should have read Dan and Chip Heath, "Making to Stick: Why some ideas and others die" long ago. Just pay up the USD 12.47 for it than to discover it as a free ebook from the library and download it for free. The nuggets of wisdom from this book could be very helpful to NaviMap.