The lesson
Every lesson. That's the point of S1 — it's the module that catches everything the other eight leave uncovered.
What this module forces
S1 covers the fallback layer. Fire, shelter improvisation, signalling, and the mental model that separates inconvenience from emergency. Every other module has S1 as its safety net.
The questions this module asks
Do you carry redundant fire — three independent methods?
Do you have signalling redundancy — sat + visual + audible?
Can you improvise shelter with what's on your body if the pack is lost?
Do you have a written decision framework for 'this is now an emergency'?
The verdict
Green
Three-fire redundancy, three-signal redundancy, on-body shelter capability, written trigger.
Amber
Two of four present.
Red
One or none. S1 is decorative.
Ready to run every module against your plan?
Open the Expedition Planner