To see the routing for an opponent, you just need to go to the ongoing race, then your opponent's profile.
Thanks to the routing button on top of the profile, the routing tool appears.
You then just need to position the routing target on the destination where your want to meet up with your opponent course.
Once the destination is validated, your opponent's routing will launch, the date and arrival time at your selected destination appear.
This feature is only available to players who have a VIP subscription.