Transaction data of a first party and transaction data of a population are both analyzed to determine weighting and normalizing factors, which when applied to data operate to prioritize and personalize the data. The prioritization of the data is based on the analysis and results in use of the data in accordance with user preferences as evidenced in prior activities of the first party represented by the transaction data. In a navigation system, applying data prioritizations speeds performance of the system and eliminates duplicate or follow-on searches, and allows efficient selection of potential routes and destinations.