The up-to-date pdf bus route map for Napoli (Naples) Italy isn’t easy to find on the internet. But just click the map image below to go to the website of unicocampania.it, where the NAPLES METROPOLITAN INTEGRATED TRANSPORT NETWORK MAP – CENTRAL AREA can be found. It’s in Italian, of course, but there’s a key in English. To get your bearings on the map, look for the Centro Storico (Historic Center); to the right you’ll see the Central Train Station; the airport is top right, etc.
On the same page, you’ll find links to public transport pdf maps of Pompeii and Sorrento and the Amalfi coast. See also the link to the Alibus Airport Shuttle bus, with information about times and fares.