Hole 1
Par 4 · 430 yd
Plays west. Dogleg left. 9 bunkers.
Green 30 yd deep, 27 yd wide. Falls 3% overall. An arrow every 4 m here, every 2 m in the app.
Golf course in Chevy Chase, Maryland, USA
18 holes, par 71, about 6,911 yards (6,319 metres) along the hole lines. The par 3s are 4, 9, 12 and 15. The par 5s are 6, 8 and 11. The longest hole is the 8th at 594 yd, the shortest the 15th at 164 yd. The map shows 80 bunkers. Water is in play on holes 4, 5, 10, 13, 15, 16 and 17.
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 · 430 yd
Plays west. Dogleg left. 9 bunkers.
Green 30 yd deep, 27 yd wide. Falls 3% overall. An arrow every 4 m here, every 2 m in the app.
Par 4 · 430 yd
Plays south-west. 5 bunkers.
Green 37 yd deep, 26 yd wide. Falls 4% overall. An arrow every 4 m here, every 2 m in the app.
Par 4 · 444 yd
Plays south. 6 bunkers.
Green 30 yd deep, 33 yd wide. Falls 2% overall. An arrow every 4 m here, every 2 m in the app.
Par 3 · 185 yd
Plays south-east. 2 bunkers and water.
Green 26 yd deep, 28 yd wide. Falls 2% overall. An arrow every 4 m here, every 2 m in the app.
Par 4 · 358 yd
Plays west. Dogleg left. 8 bunkers and water.
Green 32 yd deep, 22 yd wide. Falls 4% overall. An arrow every 4 m here, every 2 m in the app.
Par 5 · 433 yd
Plays north. 6 bunkers.
Green 30 yd deep, 30 yd wide. Falls 3% overall. An arrow every 4 m here, every 2 m in the app.
Par 4 · 441 yd
Plays north. Dogleg right. 5 bunkers.
Green 33 yd deep, 26 yd wide. Falls 3% overall. An arrow every 4 m here, every 2 m in the app.
Par 5 · 594 yd
Plays east. 7 bunkers.
Green 33 yd deep, 25 yd wide. Falls 4% overall. An arrow every 4 m here, every 2 m in the app.
Par 3 · 242 yd
Plays south-east. 2 bunkers.
Green 33 yd deep, 31 yd wide. Falls 4% overall. An arrow every 4 m here, every 2 m in the app.
Par 4 · 494 yd
Plays west. 7 bunkers and water.
Green 35 yd deep, 27 yd wide. Falls 3% overall. An arrow every 4 m here, every 2 m in the app.
Par 5 · 393 yd
Plays north-east. 6 bunkers.
Green 35 yd deep, 22 yd wide. Falls 4% overall. An arrow every 4 m here, every 2 m in the app.
Par 3 · 206 yd
Plays west. 3 bunkers.
Green 26 yd deep, 27 yd wide. Falls 3% overall. An arrow every 4 m here, every 2 m in the app.
Par 4 · 402 yd
Plays west. 6 bunkers and water.
Green 37 yd deep, 28 yd wide. Falls 4% overall. An arrow every 4 m here, every 2 m in the app.
Par 4 · 423 yd
Plays south-east. 3 bunkers.
Green 33 yd deep, 31 yd wide. Falls 3% overall. An arrow every 4 m here, every 2 m in the app.
Par 3 · 164 yd
Plays north-west. 1 bunker and water.
Green 33 yd deep, 28 yd wide. Nearly flat overall. An arrow every 4 m here, every 2 m in the app.
Par 4 · 432 yd
Plays north-west. Dogleg right. 4 bunkers and water.
Green 31 yd deep, 32 yd wide. Falls 4% overall. An arrow every 4 m here, every 2 m in the app.
Par 4 · 425 yd
Plays east. 7 bunkers and water.
Green 27 yd deep, 28 yd wide. Falls 4% overall. An arrow every 4 m here, every 2 m in the app.
Par 4 · 414 yd
Plays east. 10 bunkers.
Green 35 yd deep, 30 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.