Hole 1
Par 4 · 360 yd
Plays south. 1 bunker and water.
Green 24 yd deep, 22 yd wide. Falls 4% overall. An arrow every 4 m here, every 2 m in the app.
Golf course in Groton, South Dakota, USA
9 holes, par 36, about 3,084 yards (2,820 metres) along the hole lines. The par 3s are 4 and 8. The par 5s are 3 and 9. The longest hole is the 3rd at 503 yd, the shortest the 4th at 130 yd. The map shows 7 bunkers. Water is in play on holes 1, 4, 6 and 9.
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 · 360 yd
Plays south. 1 bunker and water.
Green 24 yd deep, 22 yd wide. Falls 4% overall. An arrow every 4 m here, every 2 m in the app.
Par 4 · 353 yd
Plays south. 3 bunkers.
Green 26 yd deep, 19 yd wide. Falls 2% overall. An arrow every 4 m here, every 2 m in the app.
Par 5 · 503 yd
Plays east. 1 bunker.
Green 24 yd deep, 22 yd wide. Falls 2% overall. An arrow every 4 m here, every 2 m in the app.
Par 3 · 130 yd
Plays north-west. Water.
Green 21 yd deep, 20 yd wide. Falls 1% overall. An arrow every 4 m here, every 2 m in the app.
Par 4 · 394 yd
Plays north-west. 1 bunker.
Green 20 yd deep, 19 yd wide. Nearly flat overall. An arrow every 4 m here, every 2 m in the app.
Par 4 · 328 yd
Plays south-east. Water.
Green 20 yd deep, 19 yd wide. Falls 3% overall. An arrow every 4 m here, every 2 m in the app.
Par 4 · 371 yd
Plays west. Dogleg left. 1 bunker.
Green 17 yd deep, 22 yd wide. Falls 1% overall. An arrow every 4 m here, every 2 m in the app.
Par 3 · 177 yd
Plays north-east.
Green 19 yd deep, 19 yd wide. Nearly flat overall. An arrow every 4 m here, every 2 m in the app.
Par 5 · 469 yd
Plays north. 1 bunker and water.
Green 27 yd deep, 16 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.