Consol - previously "Sonne"
See here -
Consol navigation system
We used Consol from time to time in the early '70s as part of the grand panoply of antique navigation aids available to BOAC transatlantic 707 and VC10 flights - just to demonstrate that we could count.
Also required to demonstrate skill in the use of Air Plot and Circum-zenith fixes before being awarded "real" Nav Licences. I've probably still got the Consol CAP somewhere. Please pass the port. LFH