The HARCO fitted to BEA's Super 111s was Decca powered and was great for the German Internals operations out of Templehof and down the three "Corridors" to the various German destinations. I liked it very much and it included a moving map. The waypoints for each sector were built into a "Turret" and there was a little suitcase full of turrets...You just checked the Turret Number on your Plog, got that Turret out of the little case and plugged it into the centre console. You could lock the autopilot onto it and it would fly you all the way. Large angle turning points would be "Shortcut" to perfection with a turn before the point which rolled out exactly on the outbound track. A jolly handy piece of kit for a two crew aircraft. The relevant VORs and NDBs would all be tuned by the co-pilot and their needle on the RMI checked as HARCO did the turn...Harco was always spot on.