Technology
PinFlag is a measurement system before it is an app. These pages explain the engine, the geometry, the honesty rail, and the native map — plainly, with the receipts.
How PinFlag works
The full loop in plain language — geometry, dispersion, lie, pin, live numbers.
Strokes-Gained Engine
A frozen, hash-verified engine built on Mark Broadie’s published expected-strokes baselines.
Course Geometry
Commercial course geometry data, combined with operator-verified courses — validated before it can back a number.
Data Honesty
On a verified course, every number is real, traceable, and disclosed.
Apple-Native Course Mapping
A native Apple MKMapView under the entire on-course experience — not a web map.