NDB approach in the 70s
We were still doing them in the 80s in the B737-200 going into places like Mahon where the minima was lower because the NDB was straight in but the VOR was offset. We seemed to manage quite well. Oh and btw we usually hand flew them without too much effort.
Want a groundspeed check? All we had was a "barrel" dme presentation so you used the stopwatch! We even navigated to the Canaries with just VOR, ADF and DME!
Fuel checks? We actually used things called graphs to do this (no FMC)! Maintain speed in the cruise - we used MANUAL thrust adjustment (no autothrottle).
How did we manage?