22. The portable navigation device as claimed in claim 14 , wherein the microprocessor selects at least one of the set of keywords based on an external event.
22. The portable navigation device as claimed in claim 14 , wherein the microprocessor selects at least one of the set of keywords based on an external event. 23. The portable navigation device as claimed in claim 22 , wherein the external event is a predetermined time period, weather condition, a position notification, a speed notification, or a navigation mode (for pedestrians or for cars) notification, or combinations thereof.