GPS Speedometer for Classic & Vintage Cars

Yes. GPS Speedometer works in ANY vehicle regardless of age — it relies on satellites, not the car's electronics. Mount your iPhone, get speed. Works in pre-war classics through modern vehicles.

GPS = 1-2% accuracy. Mechanical speedos drift with cable wear, gear wear, and tire-size changes — old speedos are typically 5-15% off. GPS is more accurate than most original equipment.

Yes — that's the whole point. Suction mount, vent mount, or dash pad — zero modifications, zero drilling, zero wiring. Fully reversible in seconds.

In most US states and Canada, a phone-based speedometer is fine as a primary or supplementary readout — there's no requirement that the factory gauge be functional, only that you obey posted limits. Some EU jurisdictions (notably Germany's StVZO) require a working physical speedometer for road use; in those countries, treat the iPhone as a supplement to a working factory gauge, not a replacement. **Always confirm the rules with your local DMV / equivalent authority** before relying on a phone speedometer as a primary readout — laws vary and change over time.

The trip recording stops at the moment the phone shuts off, but the trip-so-far is automatically saved. When you power the phone back on, GPS Speedometer offers to **resume the trip** so the data continues into one record — provided not too much time has passed (the resume window is short to keep the trip log honest). If you reconnect quickly (e.g., after plugging into a 12V outlet), you keep one continuous record. Practical mitigations: keep the phone plugged into a cigarette-lighter or USB adapter during long drives — continuous GPS use drains 10-20% per hour, so a full charge gets you 5-10 hours, but a 12V drive-charger keeps you topped up indefinitely.

Indoor GPS is unreliable. Once you're outside with sky view, GPS locks within 30-60 seconds. For warm-up drives in a garage, expect no signal until you exit.

Yes. Many restorers use GPS Speedometer to verify the restored speedometer's accuracy on a known route. Cross-reference your gauge against GPS — if they disagree, you know there's drift.

GPS doesn't care about tire size — it measures actual ground speed from satellites. Original speedometers DO care, which is why they drift after tire upgrades. GPS is immune.

GPS Speedometer is free to download. Essential features (live speed, trip distance, basic recording) are free forever. Premium features require subscription.