Which feature on the Navy Cash card is used to make purchases both on and off the ship?

The magnetic strip on the Navy Cash card is the correct choice for making purchases both on and off the ship. This feature stores encrypted information that allows for the secure processing of transactions. When swiped at terminals or card readers, the magnetic strip provides the necessary data to complete a sale, which is particularly useful for purchases in various retail environments, both aboard the ship and in other locations, such as Navy Exchanges or approved off-base vendors.

The chip on the card also plays a role in securing transactions but is generally more utilized for enhancing security during onboard purchases, particularly when operating in more secure environments. The billing address is relevant for billing and correspondence purposes, but it is not a feature used directly to process transactions. The account number is important for managing and identifying accounts but does not facilitate a transaction in the same way that the magnetic strip does.