Speedometer help

For the iPhone and Android apps and the web app at speed.hertzmc.com

The speed shows "–"

GPS hasn't found you yet, or location is off. GPS needs a view of the sky, so it may not work inside buildings, garages or tunnels.
iPhone: Settings → Speedometer → Location → While Using the App, and turn on Precise Location.
Android: Settings → Apps → Speedometer → Permissions → Location → Allow only while using the app, and turn on Use precise location.

It doesn't match my car

Car speedometers are built to read a little high, often a few percent. GPS speed is usually closer to how fast you're really going. GPS can lag for a second when you speed up or slow down.

Using the HUD at night

Tap HUD, turn your screen brightness up, and lay the phone flat on the dashboard, screen up, with the top of the phone toward the windshield. The windshield reflects the speed the right way round. Tap HUD again to go back.

mph or km/h

Tap the unit under the number to switch. Max, average and trip switch too.

Starting a new trip

Tap Reset trip, then Confirm. It takes two taps so a bump can't wipe your trip.

The apps are free and show one small banner at the bottom. Ads are hidden in HUD mode. See the privacy policy for what the ads collect.

Contact

Email speedometer@hertzmc.com.