A navigation method is implemented by a group of portable devices which are associated with a map-and-information system and each of which is communicatively coupled to an instrument cluster device of a respective vehicle. The group of the portable devices includes a leader device and at least one follower device. The map-and-information system computes, for the follower device, a dynamic navigation path from the follower device to the leader device. The instrument cluster device of the vehicle that corresponds to the follower device perceivably outputs the dynamic navigation path.