The 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 page of interactive and downloadable maps.
This opens the page of unicocampania.it. Scroll down it to see the maps of Napoli’s transport networks. They’re in Italian, of course, but if you don’t know the lingo, that shouldn’t be a problem. To get your bearings on the map, look for the Centro Storico (Historic Center); to the right you’ll see the Stazione Centrale (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.