You may need to update the device software when you install the device or add an accessory to the device.
This device supports up to a 32 GB memory card, formatted to FAT32.
Before you update the software, you can check to the software version installed on your device (Viewing System Software Information). Then, you can go to garmin.com/support/software/marine.html, select See All Devices in this Bundle, and compare the installed software version to the software version listed for your product.
If the software on your device is older than the one listed on the website, follow the steps to load the software on a memory card (Loading the New Software on a Memory Card), and then update the device software (Updating the Device Software).