Using a memory card with your GPS unit can take your navigation to another level, enabling you to update existing maps, add maps or add multimedia files. GPS memory card slots typically accept removable micro, mini or full-size Secure Digital cards. You can purchase these tiny cards with maps on them, or you can use them to transfer map and data files from your computer to the GPS unit. Not all GPS units have memory card slots, but if yours does, consider using it to upgrade your existing GPS instead of buying a new one. Writer Bio
