The Sat Nav used on Driving Tests:
https://amzn.to/3ocEuXV
(Correct at January 2021)

In this video we look at some tips for using SatNav, and how it's generally better to ignore the voice and just have a glance at the screen instead.
1) Don't let Sat Nav be a distraction
2) Don't trust the information (especially speed limits)
3) Sat Nav may not tell you about every junction: you still need to look out for Give Way lines etc