Computing in Cardiology is hosted in the central city of Karlsruhe. Daytime activities are within easily walkable distances. A public transport ticket (Sunday to Wednesday, Karlsruhe city) is included in the conference fee. You can find the ticket in the confirmation mail of your registration. Google Maps is mostly accurate for public walking and public transport options, the KVV local transportation website/app is sometimes more up to date and can also be used to purchase additional tickets (e.g. for Saturday or Thursday).
