If you need cash, an ATM is convenient, but not always the best option. If the machine offers debits in your card's currency, it's usually better to choose the local currency—that way, the bank will handle the conversion, rather than the ATM at a less favorable rate.
It's also helpful to remember to have reserves:
Don't withdraw every last penny from your card;
- Keep receipts and notifications until the end of your trip;
- Avoid repeated withdrawals if the first transaction fails. Sometimes the problem isn't a lack of funds, but a technical limit or temporary anti-fraud feature.