Clearance altitude is inadequate to clear obstacles

[aterpster]

I wouldn't exactly call it "double checking". You should, scratch "should", you have a responsibility to continually know where you are. Google NTSB-AAR-77-08

Amen. Then there is Latin America, Asia, and Africa.

 

[aterpster]

And, more recently, Dillingham, Alaska. Controller zero. Flight crew somewhere minus zero.