After a few years of diligent study,here's the method I've had the most success with on the nattracs.
Try 5598,then 8906,then 13336.If you are still feeling keen choose another frequency completely at random from the chart(forget all that "nat A,B,C,," stuff,prop forcasts etc,just stick a pin in).If it's a line check and you've still had no joy try a for a relay.If that fails,do the crossword and repeat the cycle at the next waypoint.
