Ha ha ha! 
Back in the "day", so to speak, I was taking a type rating ride in a DC-6B! During the oral part of the ride, we go over all the aircraft systems and then he, the examiner, went over the different instrument approaches we would do during the ride. He touched briefly on an ADF approach and gosh, hadn't shot one of those in years, but thought what the heck, I figure it out as we go.
It was VFR, so we didn't have to fool with ATC, did all the "air" work, steep turns, engine out stuff and all that junk, then shot 3 ILS's into the old Naval Air Station at Albany, Ga, the headed to Valdosta to shoot a couple of ADF approaches into Thomasville, Ga, and everything went pretty smooth for me first couple of approaches, wind out the NW about 330, inbound heading track was 240 as I recall, so had my drift computations worked out in my head before the first one, so everything went pretty smooth.
About that time he gives a "hold" at 4,000, left turns on the NDB! after about two tracks, I am on the inbound leg and all of sudden, he says, make right turns and hold at 3,000 feet, 1 min legs. Oh crap, every figure in my head went out the window and had to start over, while descending to 3,000 feet. I must have worked it out ok, as I passed the ride ok.
Can you visualize what it would be like with todays traffic, with aircraft stacked from 5,000 to 15,000 and having to descend with a NDB approach into a major airport? The advancement in electronic navigational aids has been the most important improvement in air transportation since the invention of the Jet engine! LOL
