Abstract: In one or more arrangements, navigation system for a vehicle comprises a plurality of sensors which are configured to sense a respective physical property and output a set of physical parameter data which is indicative of the physical property; a weighting module which is configured to generate a weight value for each set of physical parameter data based on at least one further parameter; a memory for storing predetermined physical parameter data and associated predetermined location data; a compiler module which is configured to: rank the sets of physical parameter data according to the weight values, match at least some of the ranked sets of physical parameter data with sets of predetermined physical parameter data which are stored in the memory, generate vehicle location data and compile vehicle navigation data comprising at least one of a bearing or distance from the vehicle to a target.