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Plan trail days with clear carry targets before you leave the trailhead. Record distance, climb, expected hours, heat band, and shade, then turn those inputs into hourly water use and a full day water need. Place refill stops with arrival times so each segment shows how much to carry, how many energy packs to pack, and when the next stop arrives. A large carry card keeps the next segment visible at a glance, while a refill timeline and heat band comparison help you see how warmer days raise the total. Water and food weight roll into pack load, and overload alerts appear when the combined mass crosses your set limit. After the outing, log actual water and hours to refine your personal use factor. A trail ledger and trend view show how that factor shifts across climbs and heat bands, so later days start closer to your real pace. Routes, notes, local backup, and reminders stay on device to support steady packing decisions from planning to return.

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wenyao @yahoo.com. Please include your device model, iOS version, and a brief description of the issue. We aim to respond within a reasonable time.