USFS FSTopo
USDA Forest Service
Often fresher and more trail-accurate than US Topo inside national forests (the Forest Service's own primary base map series, with FS road numbers critical for rescue callouts). National forests are where a large share of survival scenarios actually happen.
Editor's notes
Coverage limited to Forest Service lands. Legacy FSTopo series is static/unmaintained — prefer current series.
GeoTIFF and PDF per quad (interactive quad-picker viewer also available); updated annually from authoritative interagency data
~10-30 MB per quad; covers all 193 million acres of NFS land
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Source & license
US federal government work (public domain).
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