Happy days indeed. I worked for Decca Survey in the UK (later Racal Survey) and started out on land based electronic navigation system. I worked for the Pulse 8 department for a while when we used it to send differential corrections for the GPS. The reference station was in Aberdeen. Did a lot of work on error correction coding. Decca/Racal had the first differential system running for precision positioning. Back in the days when SA was still on and sub meter accuracy was required instead of the then circa 100m of GPS. I believe we were the world leader at the time. How things have changed!
