Way back in my army days I made it a point of pride to keep my 'map to ground' skills high, and that included celestial nav.
Granted, mtg is no use in the middle of the ocean, but on the ground it is a skill in it's own right, and pretty essential in some places in Australia where you have triple canopy rainforest blocking out the sky, and/or high iron content soil where compasses do weird stuff. Even out in areas where the termites and ants make tower nests (in some cases up to ten feet tall), compasses are next to uselss at times, and radio signals get sporadic.
GPS is fine, but a manual backup is an insurance policy.
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