The service behaviour is in accordance with the Synchronous Request/Reply pattern detailed in Message Exchange Patterns: Identification Guidelines. The OGC Web Map Service 1.3.0 Interface Standard is used.The behaviour in normal conditions is as follows:- The request message is sent from the service consumer to the service- The service consumer remains blocked while awaiting the reply- The service remains blocked while processing the reply- The aeronautical aerodrome map, the reply message, is sent from the service to the service consumer.