Mrs Halliday had a directional problem when she was learning to fly. She somehow got it into her head that the nose of the aircraft always pointed North. This was at the basic nav ex stage when someone else was teaching her. Apparently it took careful questioning and some deduction to fathom the cause of her random wanderings. I launched her on her qualifying x-cty and confess I made a few phone calls around the country following her progress.
I`d never heard of SCA til this thread, not surprising when I haven`t instructed for aeons, but agree its quite elegant. Its main commendation over TE/CA to me is that it gets you back on track fairly quickly. You just can`t afford to be off track 2.5 miles in the South of England - not for long anyway. Merrily closing back to your next waypoint becomes very academic if you fly through a couple of the everyday hazards you`ve concientiously marked on your map.
In our first Dak company, Bill and I would jeer a bit if we caught each other drawing lines on maps. That`s like the Russian habit of colouring in airways on Jepps. Nowadays whenever I`m out and about VFR at 80kt or so I set off with MDR then do whatever is necessary - and I wouldn`t exclude track crawling.
There are some good ideas on this thread. Just go and practice.
GH