co-driver
noun /ˈkəʊ draɪvə(r)/
/ˈkəʊ draɪvər/
- a person who shares the job of driving a vehicle with another
- He was there as co-driver of the truck and was asleep at the time.
- (in rally driving) a person who sits next to the driver to give directions
- The co-driver is responsible for memorizing the route and relaying exact instructions.