Green guides: every green on your course, read.

Each green can be read three ways. Break shows contour lines with arrows for the direction and severity of the slope. Numbers puts slope figures on it. Thermal shades the surface by elevation, from low to high.

Tap anywhere on the green for the slope at that spot. The guide can be turned to face the line of play, so the green appears the way it does from the fairway, or set north-up.

Tap to place a pin and the guide draws the fall lines around it, with the straight uphill and downhill line through the cup.

Course staff can publish a hole location, and every golfer who opens that green then sees the break to it. A golfer can also set a pin of their own, which stays on their device for the day.

The guides print. One green prints as a sheet, and the whole course prints as a green book.

Each guide is computed from drone elevation data of the actual putting surface, read on a one-yard grid. Nothing is drawn by hand or from memory.

A green is closely mown and open to the sky, which is the surface drone photogrammetry records best. Our guide to photogrammetry and LiDAR for golf courses explains why. A guide shows the green as it was on the day of the flight, so a rebuilt green needs to be flown again.

The Rules of Golf limit the green-reading materials a player may use during a round, and a committee can restrict them further by Local Rule. Check what applies to your competition. Before the round, and in casual play, golfers can study the greens as much as they like.

Green guides are one layer of a golf course digital twin. Golfers reach them from the same link as the hole tours, the yardages, and the AI caddie, which can use the slope of the green and the published pin in its answers.