co-driver

noun
1
a person who shares the job of driving a vehicle with another
هم‌راننده, راننده همیار, راننده همراه, کمک‌راننده, راننده‌ی کمکی
2
a person who sits next to the driver to give directions
کمک‌راننده, هم‌راننده, نقشه‌خوان
The co-driver is responsible for memorizing the route and relaying exact instructions.