They are reference values, not survey-grade measurements. Please do not use PeakGainLog for official surveying or to plan a mountain route where precise elevation data matters for safety.

On iPhones with a barometric altimeter, PeakGainLog uses it for a stable reading of relative elevation change. On older or newer models without one, it falls back to GPS altitude. Small up-and-down movements are filtered out as noise, so on hilly, uneven terrain the GPS-based total tends to come in noticeably lower than a barometer reading — in our own checks, around two-tenths lower on rolling terrain. Each session records which method was used.

No. PeakGainLog only measures while the app is open in the foreground. If you lock the screen or switch to another app, measuring stops. This is an intentional design choice so the app never has to ask for background location access. Keep the app open in front of you while you walk.

No. PeakGainLog deliberately leaves those out. It measures one thing only — the height you climbed — and does not touch fitness or training metrics.