They work late into the night writing and double-checking pace notes, before translating and calmly relaying their complicated shorthand with pinpoint accuracy and timing as the car in which they are seated bucks and kicks like a fairground rodeo ride.
They must be ready to cajole, encourage and reassure when appropriate - only to slide into the background when the TV microphones, camera lenses and recording machines are thrust at their colleagues with whom they spend more time than their partners at home.
Welcome to the life of a WRC co-driver.
Next week we turn the spotlight onto those who are so much more than navigators in a series of features, profiles, interviews and videos here on wrc.com and across the official WRC’s social media channels.
Co-driver Week, presented by Anonimo, starts here on Monday with an analysis of how the role has evolved over the years and look out for the first video clips in our top 10 co-driver countdown.