17. The system as claimed in claim 12 wherein the control unit is for generating a travel route based on the candidate route.
12. A content delivery system comprising: a control unit for: determining a context for identifying a device within a geographic region, identifying a feature including a key feature and a contrastive feature of a candidate route, generating a route description based on the feature, generating a prompt based on the context for adding or removing the feature from the route description, and a communication unit, coupled to the control unit, for delivering the prompt on the device.