A colleague many years ago had a student experiencing difficulty map reading. All was going well on a navex one day with bloggs studying map then locating features on ground.
Approaching a particular feature, bloggs says "railway turns right 90 degrees, town at bend, mountain in background". Bloggs looks ahead and identifies all features.
Colleague says to bloggs "what else about ralway"?
Bloggs looks at map, looks and looks at map, then in frustration looks at ground to see railway disappear into tunnel (said feature alluded to by colleague).
"AVALANCHE" shouts bloggs with much gusto.
Colleague and, bloggs-2 in back seat, roll around laughing. Bloggs-1 catches on!!
(inland light aircraft lane through Willy airspace [now part of Oz G Spot] for those familiar with location.)