Hole 1
Par 4 · 372 yd
Plays south-east. Dogleg left. 1 bunker.
Green 26 yd deep, 25 yd wide. Falls 1% overall. An arrow every 4 m here, every 2 m in the app.
Golf course in Gray Rock, Maryland, USA
18 holes, par 71, about 6,197 yards (5,667 metres) along the hole lines. The par 3s are 6, 9, 13 and 18. The par 5s are 7, 12 and 17. The longest hole is the 17th at 568 yd, the shortest the 18th at 145 yd. The map shows 42 bunkers. Water is in play on holes 3, 13, 14, 15 and 16.
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 · 372 yd
Plays south-east. Dogleg left. 1 bunker.
Green 26 yd deep, 25 yd wide. Falls 1% overall. An arrow every 4 m here, every 2 m in the app.
Par 4 · 370 yd
Plays south-east. 1 bunker.
Green 38 yd deep, 23 yd wide. Falls 4% overall. An arrow every 4 m here, every 2 m in the app.
Par 4 · 381 yd
Plays north-east. 3 bunkers and water.
Green 33 yd deep, 28 yd wide. Falls 5% overall. An arrow every 4 m here, every 2 m in the app.
Par 4 · 308 yd
Plays north. Dogleg right. 2 bunkers.
Green 31 yd deep, 27 yd wide. Falls 8% overall. An arrow every 4 m here, every 2 m in the app.
Par 4 · 387 yd
Plays north-west. 1 bunker.
Green 27 yd deep, 30 yd wide. Falls 2% overall. An arrow every 4 m here, every 2 m in the app.
Par 3 · 163 yd
Plays east. 3 bunkers.
Green 31 yd deep, 33 yd wide. Falls 4% overall. An arrow every 4 m here, every 2 m in the app.
Par 5 · 512 yd
Plays south-east. 1 bunker.
Green 27 yd deep, 35 yd wide. Falls 2% overall. An arrow every 4 m here, every 2 m in the app.
Par 4 · 347 yd
Plays south-east. 2 bunkers.
Green 31 yd deep, 34 yd wide. Falls 5% overall. An arrow every 4 m here, every 2 m in the app.
Par 3 · 182 yd
Plays north-west. 2 bunkers.
Green 32 yd deep, 31 yd wide. Falls 4% overall. An arrow every 4 m here, every 2 m in the app.
Par 4 · 324 yd
Plays south. Dogleg right. 3 bunkers.
Green 35 yd deep, 36 yd wide. Falls 4% overall. An arrow every 4 m here, every 2 m in the app.
Par 4 · 390 yd
Plays east. 1 bunker.
Green 35 yd deep, 27 yd wide. Falls 4% overall. An arrow every 4 m here, every 2 m in the app.
Par 5 · 480 yd
Plays west. 6 bunkers.
Green 33 yd deep, 28 yd wide. Falls 3% overall. An arrow every 4 m here, every 2 m in the app.
Par 3 · 159 yd
Plays north-west. 2 bunkers and water.
Green 36 yd deep, 34 yd wide. Falls 4% overall. An arrow every 4 m here, every 2 m in the app.
Par 4 · 379 yd
Plays south. Dogleg right. 3 bunkers and water.
Green 34 yd deep, 25 yd wide. Falls 3% overall. An arrow every 4 m here, every 2 m in the app.
Par 4 · 390 yd
Plays north. Dogleg left. 3 bunkers and water.
Green 36 yd deep, 32 yd wide. Falls 4% overall. An arrow every 4 m here, every 2 m in the app.
Par 4 · 339 yd
Plays north. 3 bunkers and water.
Green 30 yd deep, 25 yd wide. Falls 3% overall. An arrow every 4 m here, every 2 m in the app.
Par 5 · 568 yd
Plays south-west. 3 bunkers.
Green 42 yd deep, 25 yd wide. Nearly flat overall. An arrow every 4 m here, every 2 m in the app.
Par 3 · 145 yd
Plays north-west. 2 bunkers.
Green 30 yd deep, 22 yd wide. Falls 2% 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. 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.