Prior to traveling outside of your normal area of debit or credit card use, be it domestic or foreign, please call Sentinel Federal Credit Union at least 48 hours in advance at 605-923-1405 or toll-free at 888-923-1400 to let us know the dates and locations you will be visiting. We will place a memo on your account, which will prevent your debit and credit cards from possibly being blocked due to unusual activity in those locations.