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Altitude knowledge
Background for planning a trek or expedition at high altitude — based on the CDC Yellow Book and the Wilderness Medical Society guidelines. The same articles are available offline in the app.
Understanding altitude sickness
Acute mountain sickness, HACE and HAPE: what they are and why severe symptoms need urgent action.
Read article →How acclimatization works
How your body adapts to thinner air, how long it takes, and what helps.
Read article →Why sleeping altitude matters
Where you sleep matters more than the highest point of the day.
Read article →Planning acclimatization days
General ascent recommendations and why an extra day can make a difference.
Read article →Warning signs and when to descend
The rules that matter most at altitude. Read this before every trip.
Read article →Check your itinerary with AltitudeAhead
Enter where you'll sleep each night. AltitudeAhead draws your sleeping-altitude profile, highlights days with large gains above 3,000 m and shows where an acclimatization day may fit.
Coming soon to the App Store