For Road Rallies [held through the night], the emphasis is as much on accurate navigation as driving skill. The navigator, who uses Ordnance Survey maps to direct the driver around the route, must be very careful with timing - it's just as bad if you check in too early as it is to check in too late at a marshalled time control.
12-Car Navigational Events are based on navigational skill rather than speed, and usually with a notable social element too. The for 12-car evening/night time events are governed by Motor Sport UK and form an important part of the learning curve for novice and expert alike.