If an individual has lost their Nantucket Bank card, it is important to take immediate action to protect their personal and financial information. The first step is to report the loss to the bank. This can typically be done by visiting the bank's official website, where one can find relevant contact information and possibly access options for reporting a lost card online. Additionally, the individual should review their recent account statements for any unauthorized transactions and notify the bank if any are discovered. Once the loss has been reported, Nantucket Bank will usually guide the individual through the process of securing their account and issuing a replacement card. Keeping one’s computer security updated and monitoring account activity regularly can also help prevent future issues.