① Load GPX

Upload GPX / KML / FIT (Garmin watch), paste a link (15 MB max), or pick a shared route. Files with timestamps switch to activity replay automatically.

📂 Choose GPX / KML / FIT

Public

📥 No GPX file? Export from Strava / Garmin (3 steps)

Strava

Open strava.com in a phone or desktop browser and sign in
Open the activity → ⋯ (top right) → Export GPX
The file lands in Downloads → come back and tap “📂 Pick GPX / KML / FIT”

Garmin Connect

Open connect.garmin.com → Activities (left) → pick the activity
Top right ⚙ gear → Export to GPX (or Export Original for the FIT, which this page also accepts)

Garmin watch / Garmin Explore

Plug the watch in over USB → open GARMIN/GARMIN/Activity → copy the .FIT file here
Or the Garmin Explore app: Saved → pick activity → share as GPX

⚠️ The Strava app and the Garmin Connect phone app have no export button — use the website in a browser.

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ℹ️ About & how to use (what it does, how pace is calculated, privacy)

What it does: upload GPX / KML / FIT and fly the course over 3D terrain; with timestamps it becomes an activity replay (pace, heart rate, power, cadence).

Strava: we read your activity tracks only after you tap “Connect Strava” (read-only — nothing is modified). Credentials are stored encrypted on this server; you can disconnect here anytime, and connections idle for 30 days are revoked and deleted automatically.

Privacy: GPX files and HR / power / cadence are computed in your browser and never uploaded — only routes you tick “Public” are stored. Routes are user-supplied; always follow the organiser’s instructions on race day.

Data: Lands Department 3D Visualisation Map (3D Tiles) and terrain via data.map.gov.hk; satellite/street imagery © Esri. 3D buildings and the city mesh cover urban areas only (the mesh is heavier and off by default). Your GPX and any heart-rate/power/cadence data are processed entirely in your browser and never uploaded — only a GPX you tick as Public (including its data) is stored on the server. Routes are user-supplied; publicly shared routes are for preview only — follow on-site signage and the organiser's instructions on race day.

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JC HK Route Preview and Replay 3D