Live yardage · prototype
27 holes mapped. Distances update from your phone's GPS as you walk.
What this proves. Every polygon here is real course geometry, pulled free from OpenStreetMap — greens, tee boxes, bunkers, centrelines. Yardages land within about 3% of the printed card. Nothing was hand-drawn and no data was bought.
What it can't do yet. The screen has to stay awake — phones suspend background JavaScript, so a web page can't track you with your pocket closed. That's the wall that pushes real shot tracking toward a native app.