Navigation in the Rotterdam port area was modernized after the Second World War. Seven radar stations were built along the New Waterway between Hook of Holland and Charloisse Hoofd (level with the Maas Tunnel). The pilots on board ship communicated with the stations by portophone. With their vertical thrust and pale yellow facing, these buildings were a striking feature of the port area. Between 1980 and 1984 this shore radar system was replaced by 25 partly unmanned radar stations and vessel traffic centres with bright yellow and blue cladding designed by Van den Broek & Bakema. The old radar stations still remaining now serve as living quarters.