It stores the navigation maps. Unlike some newer models that use USB, this 2011 unit relies entirely on an 8GB SD card .
: Users can often play MP3s directly from a separate SD card slot (up to 32GB) formatted to FAT32, though the main navigation slot is reserved for the system card. Common Issues & Solutions nsdd-w61 sd card
: The SD card is not just for maps; it contains essential parts of the player's operating system Locking Mechanism It stores the navigation maps
