An apparatus comprising a processor and memory including computer program code, the memory and computer program code configured to, with the processor, enable the apparatus at least to: for a defined road journey through a road network from a start location to an end location, assign respective sub-portions of the defined road journey to each of a group of mobile devices associated with one or more travellers for the road journey according to at least one predefined assignment criterion, wherein each of the group of mobile devices is configured for provision of live mapping data for live navigation of the respective sub-portion of the road journey.