What this is · Why it exists
About
GPS Speedometer is a free, single-purpose browser tool. Open gpsspeedometer.bond, tap Start, allow location once, and you get a live readout — current speed, average and max, distance, elapsed time and GPS accuracy — with a clear privacy promise: your coordinates are processed locally in your browser and never sent anywhere.
Last updated: 30 August 2026
What it does
It's a speedometer that uses your phone's GPS via the browser's Geolocation API (coords.speed when available, otherwise Haversine distance ÷ time with smoothing). It shows big tabular numbers, a unit switcher (km/h, mph, m/s, knots), and an accuracy badge so you know when the signal is weak. No app install, no account, no trail kept.
Why it exists
People repeatedly search 'how fast am I going' or need a quick reference on a train, bike, car or boat. Most existing tools are app-store clutter or SEO filler without a live instrument. This fills that gap — a fast, honest, mobile-friendly page that embeds the live tool itself, explains its limits clearly (tunnels, urban canyons, battery use, safety), and stays out of your way. No overselling: it's a helpful reference, not a certified dashboard.
How it's built
Built with Astro (static output) + Tailwind v4 precision-tool design system, served as static CDN assets via Vercel. The GPS engine is a small TypeScript module (useGpsSpeedometer) — all in memory, no server.