Custom Garmin watch app and web dashboard
I have a Garmin Approach Watch, which is great for live yardages, but knew there was more I could get out of my setup.
Some things I knew I wanted to change:
I realzied that Garmin Forerunner watches have pretty accurate GPS - and this is actually all we need to build a comprehensive golf app.
One button per shot. Everything else is automatic.
Front, middle and back yardages from actual green geometry.
Minimap showing position on the course - shots are tracked in real-time
Scorecard shows live scores without needing to add them up. Stableford points automatically calculated.
Review every shot and how it's affecting your score
Handicap index over time, full course history
Every shot, replayed on satellite imagery.
Strokes gained, split by category — reconciled to the scorecard.
The watch logs a GPS position for every shot and syncs the round over Wi-Fi. A small server scores it — course handicap, stableford, strokes gained. Course maps are built from OpenStreetMap. Greens, fairways, bunkers and teeboxers are drawn polygons and hand-corrected hole by hole. GPS is checked against the map geometry to determine fairways hit, GIR, sand saves, driving accuracy, etc. App is live with a few friends as multiple users.
Garmin Connect IQ (Monkey C) · PHP + MySQL · React + TypeScript · OpenStreetMap
Built using Claude Code.
Link to the app - you'll land on a sign-in screen.