This invention relates to a navigation device (200) comprising: a processor (210) for generating, from map data, a digital map for display to a user; a store (230) for said map data and data defining the location of points of interest on said digital map; and a display (240) for displaying said digital map to said user; characterised in that the navigation device (200) further comprises: a short-range radio transceiver (265) for receiving signals from and transmitting signals to computer systems that are each associated with a respective point of interest; and a wireless network control module (490) that is configured to energise said short-range radio transceiver (265) for the exchange of signals if a determined current location of said navigation device (200) is within wireless communications range of a point of interest. A method is also disclosed.