Oceanic navigation with sextant aboard a USAF KC-135:
https://www.youtube.com/watch?v=xc3rAlCDf54
The two-tone noise at the beginning is someone being called on HF SELCAL. The ground station is Honolulu.
Unlike the B707, KC-135s don't carry a flight engineer (shock horror) so the navigator's position is where the flight engineer's panel would normally be. The navigator's position on the 707 was in a more cramped position at the left rear of the flight deck. Note also the LORAN viewing scope.