Hole 1
Par 4 · 449 yd
Plays north-west. Dogleg right. 6 bunkers and water.
Green 35 yd deep, 22 yd wide. Falls 3% overall. An arrow every 4 m here, every 2 m in the app.
Golf course in Potomac, Maryland, USA
18 holes, par 71, about 7,221 yards (6,603 metres) along the hole lines. The par 3s are 3, 9, 12 and 17. The par 5s are 2, 10 and 15. The longest hole is the 2nd at 629 yd, the shortest the 12th at 170 yd. The map shows 89 bunkers. Water is in play on holes 1, 3, 4, 6, 7, 9, 10, 11, 13, 14, 17 and 18.
Every hole, numbered, as the app draws it.
Each hole turned so it plays up the page, from the tee at the bottom. Every green's slopes are mapped: flip a card to see its green.
Par 4 · 449 yd
Plays north-west. Dogleg right. 6 bunkers and water.
Green 35 yd deep, 22 yd wide. Falls 3% overall. An arrow every 4 m here, every 2 m in the app.
Par 5 · 629 yd
Plays north. Dogleg right. 4 bunkers.
Green 37 yd deep, 28 yd wide. Falls 3% overall. An arrow every 4 m here, every 2 m in the app.
Par 3 · 231 yd
Plays north. 3 bunkers and water.
Green 38 yd deep, 26 yd wide. Falls 3% overall. An arrow every 4 m here, every 2 m in the app.
Par 4 · 446 yd
Plays north-east. 1 bunker and water.
Green 23 yd deep, 30 yd wide. Falls 3% overall. An arrow every 4 m here, every 2 m in the app.
Par 4 · 369 yd
Plays south. 7 bunkers.
Green 30 yd deep, 23 yd wide. Falls 1% overall. An arrow every 4 m here, every 2 m in the app.
Par 4 · 494 yd
Plays south-west. Dogleg right. 3 bunkers and water.
Green 36 yd deep, 25 yd wide. Falls 2% overall. An arrow every 4 m here, every 2 m in the app.
Par 4 · 462 yd
Plays south. Dogleg right. 5 bunkers and water.
Green 36 yd deep, 27 yd wide. Falls 2% overall. An arrow every 4 m here, every 2 m in the app.
Par 4 · 472 yd
Plays south. 5 bunkers.
Green 37 yd deep, 30 yd wide. Falls 3% overall. An arrow every 4 m here, every 2 m in the app.
Par 3 · 202 yd
Plays east. 4 bunkers and water.
Green 39 yd deep, 28 yd wide. Falls 4% overall. An arrow every 4 m here, every 2 m in the app.
Par 5 · 582 yd
Plays south-east. Dogleg left. 2 bunkers and water.
Green 38 yd deep, 15 yd wide. Falls 1% overall. An arrow every 4 m here, every 2 m in the app.
Par 4 · 472 yd
Plays east. Dogleg left. 1 bunker and water.
Green 36 yd deep, 26 yd wide. Falls 4% overall. An arrow every 4 m here, every 2 m in the app.
Par 3 · 170 yd
Plays north-east. 6 bunkers.
Green 36 yd deep, 26 yd wide. Falls 4% overall. An arrow every 4 m here, every 2 m in the app.
Par 4 · 365 yd
Plays north-east. 6 bunkers and water.
Green 31 yd deep, 26 yd wide. Falls 4% overall. An arrow every 4 m here, every 2 m in the app.
Par 4 · 302 yd
Plays north. 7 bunkers and water.
Green 30 yd deep, 23 yd wide. Falls 1% overall. An arrow every 4 m here, every 2 m in the app.
Par 5 · 496 yd
Plays south-west. 3 bunkers.
Green 33 yd deep, 23 yd wide. Falls 2% overall. An arrow every 4 m here, every 2 m in the app.
Par 4 · 414 yd
Plays west. 9 bunkers.
Green 24 yd deep, 32 yd wide. Falls 3% overall. An arrow every 4 m here, every 2 m in the app.
Par 3 · 199 yd
Plays east. 4 bunkers and water.
Green 30 yd deep, 28 yd wide. Falls 3% overall. An arrow every 4 m here, every 2 m in the app.
Par 4 · 466 yd
Plays west. 8 bunkers and water.
Green 39 yd deep, 26 yd wide. Falls 3% overall. An arrow every 4 m here, every 2 m in the app.
Lengths are measured along each hole's line on OpenStreetMap, so they can differ from the club's card. Pars are from the club's card. A bunker between two holes counts on both.
The app
On your iPhone and Apple Watch, Number & Line turns this map into a yardage book, with distances to the front, middle and back of each green from where you stand. You can plan each hole at home and get club advice from your own distances and the day's wind.
The app is coming soon to the App Store, and this course is already built for it.

Course map © OpenStreetMap contributors, under the Open Database Licence. See it on OpenStreetMap, where anyone can correct it. Green slopes: USGS 3D Elevation Program 1 m DEM (public domain). Our maps are open data too. Number & Line isn't connected with the club.