To create a smooth flawless and simple app used by Mariners to search and get the route files of ocean passages

iOS and Android App for Mariners which help them to download the route file when searched in the app. The route files are of different format .It should be divided according to different formats of manufacturers.As database is so large I will be providing database separately.The app also should have some other files which I will explain in discussion. Iam not looking for a one time development process. As I receive feedback we need to improve the app as the time passes