The Viva Viagem card (now often referred to as the "Navegante" card in some contexts) remains the essential tool for using Lisbon’s public transport in 2026. The physical green magnetic card itself costs €0.50. You can purchase it at any Metro station, ferry terminal, or suburban train station from the automated "Venda" machines. Once you have the card, you must "top it up" with credit using one of three systems: Single Tickets (approx. €1.80 for Metro/Bus), a 24-hour Pass (ranging from €6.80 to €10.80 depending on whether you include suburban trains/ferries), or the "Zapping" system. Zapping is the most popular choice for tourists; you load a cash balance (e.g., €5, €10) onto the card, and each journey is deducted at a discounted rate of approximately €1.61. The card is valid for one year from the date of purchase and is strictly for individual use; you cannot "tap" the same card twice for two people. In 2026, many locals have moved to the "Navegante" mobile app, but for short-term visitors, the €0.50 physical card remains the most straightforward and reliable way to navigate the city's trams and funiculars.