Shotgun riders are responsible for navigation to the destination. This responsibility includes reading the map, driving directions on Google Maps or Apple Maps (good luck with that), watching for exits, and operating the GPS. Poor navigation by the Shotgun rider will result in loss of Shotgun privileges.
4.2.1 Although GPS and Navigation systems work wonderfully in this day and age, you are still required to ensure that the directions are correct. You are never allowed to say “Recalculating” while riding shotgun.
Also see:
4.9.3 If requested by the driver to play Pokemon for them, Shotgun rider must navigate to Pokéstops and Gyms and constantly scan for active Lure Modules.