Return-Path: Received: (qmail 21456 invoked from network); 21 Nov 2001 15:58:03 -0000 Received: from unknown (HELO murphys-inbound.services.quay.plus.net) (212.159.14.225) by excalibur-qfe1-smtp-plusnet.harl.plus.net with SMTP; 21 Nov 2001 15:58:03 -0000 X-Priority: 3 X-MSMail-Priority: Normal Received: (qmail 7455 invoked from network); 21 Nov 2001 15:58:19 -0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by murphys.services.quay.plus.net with SMTP; 21 Nov 2001 15:58:19 -0000 Received: from majordom by post.thorcom.com with local (Exim 3.33 #2) id 166ZfF-00026n-00 for rsgb_lf_group-outgoing@blacksheep.org; Wed, 21 Nov 2001 15:51:53 +0000 Received: from mta02.btfusion.com ([62.172.195.247] helo=btclick.com) by post.thorcom.com with esmtp (Exim 3.33 #2) id 166ZfD-00026Y-00 for rsgb_lf_group@blacksheep.org; Wed, 21 Nov 2001 15:51:51 +0000 Received: from virgin.net ([213.121.109.190]) by btclick.com (Netscape Messaging Server 4.05) with ESMTP id GN5QOA05.P18 for ; Wed, 21 Nov 2001 15:50:34 +0000 Message-ID: <3BFBCCE6.DBA54B1@virgin.net> Date: Wed, 21 Nov 2001 15:48:54 +0000 From: "Stewart Bryant" X-Mailer: Mozilla 4.76 [en]C-CCK-MCD (Windows NT 5.0; U) X-Accept-Language: en MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org Subject: LF: The Rise and Fall of the Decca Navigator System Content-Type: text/html; charset=windows-1252 Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Sender: Content-transfer-encoding: 8bit This lecture is part of the IEE Surrey Branch Evening Lecture series
and may be of interest to members on the list. All are welcome.

Stewart G3YSX

Wednesday 5 December 2001 7.00 for 7.30pm

The Rise and Fall of the Decca Navigator System

Walter Blanchard (President, Royal Institute of Navigation, 1993-1996)

Wates House, University of Surrey

          The Decca Navigator was the world's most successful
          commercially operated radio navaid. From 1946 to 2000 it
          provided over 40,000 ships and aircraft with a major means
          of navigation. Originally used for the D-Day landings, this low
          frequency phase-comparison hyperbolic navaid was entirely
          developed in the UK, and at one time covered most of the
          major shipping areas of the world. Although not successful in
          the air the cockpit presentation methods invented by the
          Decca company were the forerunners of the of the modern
          "glass cockpit" - Decca having designed the first airborne
          digital computer for civil use. The talk will describe the early
          Decca trials in wartime, its use for D-Day, and subsequent
          history until its closure.

For further information contact: Stewart Bryant.