Hole 1
Par 4 · 208 yd
Plays north-east. 2 bunkers.
Green 23 yd deep, 21 yd wide. Falls 3% overall. An arrow every 4 m here, every 2 m in the app.
Golf course in Chelmsford, Massachusetts, USA
9 holes, par 33, about 1,896 yards (1,734 metres) along the hole lines. The par 3s are 2, 3, 6 and 9. The only par 5 is the 4th. The longest hole is the 8th at 332 yd, the shortest the 6th at 89 yd. The map shows 5 bunkers. Water is in play on holes 3, 4, 5, 7 and 8.
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 · 208 yd
Plays north-east. 2 bunkers.
Green 23 yd deep, 21 yd wide. Falls 3% overall. An arrow every 4 m here, every 2 m in the app.
Par 3 · 121 yd
Plays south.
Green 20 yd deep, 19 yd wide. Falls 3% overall. An arrow every 4 m here, every 2 m in the app.
Par 3 · 94 yd
Plays east. Water.
Green 22 yd deep, 23 yd wide. Falls 5% overall. An arrow every 4 m here, every 2 m in the app.
Par 5 · 326 yd
Plays west. Dogleg right. Water.
Green 17 yd deep, 22 yd wide. Falls 1% overall. An arrow every 4 m here, every 2 m in the app.
Par 4 · 320 yd
Plays east. Water.
Green 22 yd deep, 26 yd wide. Falls 2% overall. An arrow every 4 m here, every 2 m in the app.
Par 3 · 89 yd
Plays west. 2 bunkers.
Green 26 yd deep, 19 yd wide. Falls 3% overall. An arrow every 4 m here, every 2 m in the app.
Par 4 · 287 yd
Plays east. Water.
Green 20 yd deep, 22 yd wide. Falls 2% overall. An arrow every 4 m here, every 2 m in the app.
Par 4 · 332 yd
Plays north-west. Dogleg right. 1 bunker and water.
Green 23 yd deep, 23 yd wide. Falls 4% overall. An arrow every 4 m here, every 2 m in the app.
Par 3 · 119 yd
Plays west. 1 bunker.
Green 27 yd deep, 20 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.