% open formosa-caddie
Formosa Caddie
A pocket caddie for my home course — every hole, the greens, and the notes only you can take.
PROBLEM
Formosa is a Bob Charles course modelled on Augusta. The greens are big, ridged and undulating, and being on the green isn't enough, you need the right tier. There's no public slope data for any of it. A generic GPS app gives you a yardage and nothing about where the trouble actually is on this course.
WHAT I BUILT
A phone-sized caddie for Formosa. All 18 holes with verified scorecard distances off the back tee, stroke index, and a real note for each — the tree tunnel on 4, the two-tier green on 7, the infinity green over the bay on 11. A green-reading tab with a proper method for big undulating greens, and a notes tab where you log what each green actually did, saved on your phone for next round.
HOW IT WORKS
One self-contained HTML file, no build, no server, no install. The hole data and course detail are baked in from the verified scorecard and course reviews. Notes you take are saved to the phone with localStorage so they're there next time. It's honest about its edges: distances are tagged verified or by eye, and the green tab is method, not Formosa-specific contour data, because no public slope maps for this course exist.
WHERE IT'S AT
Live as a single file you open on your phone and use on the course. Works offline, saves your green notes locally, built for one course done properly rather than every course done shallow.
WHAT I LEARNED
The temptation was to fake green-slope data to look complete. There isn't any for this course, so I didn't. The app does the verified distances properly and then hands you the pen for the one thing only you can measure — what each green does when you actually putt it.
STACK
Single-file HTML · vanilla JS · localStorage · inline SVG
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