# Data Honesty > Canonical: https://pinflag.io/technology/data-honesty On a verified course, every number is real, traceable, and disclosed. “Measured” requires verified geometry, a pin you set, supported lies, and a real GPS position — all four. Anything less says “Estimated,” and when the app doesn’t know, it shows a dash. *The PinFlag iOS app is in pre-release. Leave your email and we’ll tell you the moment it’s available.* Most golf apps blend data sources into one confident-looking number. PinFlag discloses instead: “Measured” requires verified geometry AND a user-set pin AND supported lies AND a real GPS position — all four, or the number honestly reads “Estimated.” Dispersion comes from exactly one source at a time. When the app doesn’t know, it shows a dash. ## Why it matters - Most apps blend sources into one confident-looking number; you can’t audit what you can’t see. - Decisions built on disclosed data survive contact with reality. ## How it works 1. **The Measured gate** — Verified geometry AND a user-set pin AND supported lies AND real GPS — the conjunction is strict, and tested. 2. **A visible grammar** — Solid green means Measured; amber-dashed means Estimated with the reason; grey means Pending. 3. **Honest absence** — No wind model, no wind number. Unsupported lie, no strokes-gained value. A dash is an answer. ## Everything Data Honesty does - The strict Measured gate: four conditions, all required - A visual grammar you can read at a glance — solid green Measured, amber-dashed Estimated, grey Pending - Round badges that admit partiality: “Partially measured · N of 4” - One dispersion source per number — launch monitor, on-course, or model — never an average - Hand-placed balls and preview positions are always Estimated - Implausible GPS fixes are refused, not scored - No wind or elevation model yet — so those readouts are dashes, not guesses ## Who it’s for Anyone who has wondered which of an app’s numbers to actually trust — and coaches who need player data to be defensible. ## What’s different - Partiality is admitted on the badge: “Partially measured · N of 4,” with the why. - One dispersion source per number, never an average of sources — structurally impossible and mutation-tested. - Hand-placed balls and rehearsal positions can never read as Measured. ## Frequently asked questions ### What makes a number “Measured” in PinFlag? Four conditions, all true: verified course geometry, a pin you set yourself, supported lies for the shot, and a real GPS position. Miss any one and the number honestly reads Estimated. ### Why not blend data sources for a smoother number? Because a blended number can’t be audited. PinFlag uses exactly one dispersion source at a time — launch monitor, on-course, or model — and labels which. ### Does PinFlag show wind or elevation adjustments? Not yet — no wind or elevation model ships today, so those readouts show a dash rather than an invented adjustment.