# How does PinFlag detect my lie? > Canonical: https://pinflag.io/answers/courses-and-maps/how-does-pinflag-detect-my-lie From the course map. Your position is read against the fairway, rough, sand, fringe, green and hazards of the hole and priced from the matching table; you confirm the lie in one tap when you log the shot, so the number is for the shot you actually have and the map does the reading for you. Topic: Courses and course maps, https://pinflag.io/answers/courses-and-maps ## Plain facts - PinFlag is an iPhone app; the course maps and every shot live on your phone, so it works anywhere on the course. - PinFlag is launching on the App Store; the download page takes an email and tells you the day it is live. - Every number is strokes gained on Mark Broadie’s published PGA TOUR baselines, priced on the same published baselines in the app and on this site. - PinFlag prices the target you choose, with your own dispersion and the lie read from the course map; the decision stays yours, with the arithmetic done. - Every number is labeled Measured (your own data) or Estimated (a benchmark standing in), and the two are never blended. - Pins you set during a round are yours, and every round exports as CSV or JSON on request.