pixel_player467974265 This help site has everything you could possibly want to know. It is run by a player, and has no affiliation with PF other than the permission to use their data.
https://seaport.dynortice.com/
Explore the menus, and if you click on the little figure icon in the top right corner, you open a settings page, where among other things, you can put in your current game level to get more specific content.
As for the Titanic, as @Nitrum has said, it’s a long term special ship within the game. It has the potential to be with you for many hundreds of levels, and upgrading it can be viewed like a game achievement, as it can not be speeded up with gems.