Solo developer maps 18,000+ US golf courses using OpenStreetMap data

A single developer built Golf Course Browser, a free web app that catalogs more than 18,000 golf courses across the US, Canada, Puerto Rico, and Guam. Users can browse by state or find courses near them, then filter by access type (public, municipal, resort, private), hole count, course format (regulation, executive, par-3, indoor/simulator), and amenities like driving ranges. Each listing pulls in scorecards, a three-day weather forecast, and nearby courses within a chosen radius.

The underlying data comes from OpenStreetMap, with details like hole counts and amenities estimated from map attributes rather than authoritative records. That approach explains the built-in crowdsourcing features: visitors can drop a pin to add missing courses or submit corrections for closed venues, wrong public/private status, bad contact info, or location errors.

The project is a Show HN post from a hobbyist — self-described as “built by one golfer” — and runs on donations rather than a commercial model. It’s a straightforward example of turning open geographic data into a focused, single-purpose directory, with accuracy dependent on community contributions and the completeness of the source map data.