TC 3-25.26 Map Reading and Land Navigation
US Army (Army Publishing Directorate)
The standard land-navigation text: topo map reading, compass use, terrain association, dead reckoning, navigation without instruments, plus an orienteering appendix. Exactly what an offline user without GPS needs.
Editor's notes
Mirror at https://irp.fas.org/doddir/army/fm3-25-26.pdf (older FM edition) if APD blocks automated downloads.
Our offline edition
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~15-25 MB (map-graphic heavy)
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Source & license
US federal government work (public domain).
Use of this material does not imply endorsement by its publisher or any government agency.