Regarding teaching land navigation by compass:<p>I teach light infantry tactics to new lieutenants for the US Army.  There&#x27;s a couple reasons to use old-school methods over relying on your GPS:<p>* Using a compass and a map gives you a much better feel for terrain.  One of the common problems with lieutenants is a disregard for advantages and disadvantages of specific terrain.  I feel that this is by far the most important point.  Understanding and visualizing terrain from a map is a hugely valuable skill that impacts most points of an operation, specifically route planning, where to place your machine guns, and where to attack the objective from.<p>* GPS can be jammed.  This point was driven home hard by the novel Ghost Fleet.  Ghost Fleet is a white paper turned into a novel (because no one would read a whitepaper) on what a future war with China would look like.  I&#x27;m pretty sure Ghost Fleet is also the impetus for the Naval Academy re-adding celestial navigation to their classwork.<p>* GPS doesn&#x27;t always work, or takes a while to get enough satellites to get a fix.  You know what really sucks: taking fire and not knowing where you are.<p>* Batteries are heavy.  Yes, tech is improving and you typically only need AA batteries.  But soldier weight for light infantry is and continues to be a challenge.