UPDATE: Reading customer's reviews - they said this will work with 2018, 2019 and 2020 Toyota Yaris (scroll to the bottom): https://amzn.to/2O5hoUy

How to install navigation (maps/GPS) on your 2016-2017 Toyota Yaris iA or Scion iA. All you have to do is buy a Toyota Navigation SD Card. Insert this SD Card into the SD Card slot to activate In-Dash Navigation.

The dealership wants over $1000 to install this. The official SD Card was only $60.