A computer.
This website.
Welcome to the official Kia - Navigation update website. You can update your navigation system to the latest version to access the latest traffic information
update.kia.com
Depending on year of car, a 32gb SD card or a USB stick.
If you have slot under the screen saying map SD then it will be a SD card.
Have to download the installer to computer. Best idea is to find the current software number on your car.
Press the settings button on dashboard for 3 seconds and make a note of it.
Type this into the installer and it will download the correct software. Ensure the SD card is in computer.
Place card in car and it will update.