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All variables matter in subsurface navigation, especially at night. Those who know, already know...
...but it does correlate with land nav. Compass, map, pace, orienteering, etc. ...it all matters. Proficiency in every aspect of the skills that are involved is what makes or breaks an individual at "crunch time"... when doubt seeps into the minds of those who are in "over their head".
(forgive the pun)
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