Written by Muneeb Rana · Last updated 26 October 2026
Quick answer: Yes, a speedometer offline still works: satellites broadcast free signals and your phone needs no mobile data to compute speed and distance. What may need data is the first fast fix (assisted GNSS) and map tiles. In Speedometer PRO the Speed and Compass views work offline; the map may show blank areas without data.
TL;DR
- Speed and distance: no data needed.
- First fix is faster with data.
- Maps need data unless cached.
- Works in airplane mode on most phones.
- Useful abroad without roaming.
Speedometer offline: why it works
GNSS signals are one-way broadcasts. Your phone listens; it never transmits to satellites. Speed is computed on the device. See how GPS speedometers work.
What needs data
Assisted GNSS downloads orbit and time data to speed the first fix. Without it the phone must decode this from satellites, which can take longer. Map tiles from Mapbox need data unless cached. Ads also need data.
Airplane mode
| Feature | Airplane mode |
|---|---|
| Speed | Works (GPS stays on, most phones) |
| Distance | Works |
| Compass | Works |
| Map tiles | May be blank |
| First fix | Slower |
Travelling abroad
Turn off roaming and use the speedometer as normal. Open the app once on Wi-Fi before leaving to warm up assistance data.
On planes
Follow crew instructions about devices. Near a window, GPS may show ground speed; see airplane speed app.
What needs data
Live speed, distance and the trip card rely only on GPS. The map tab needs internet to download tiles, unless they are cached from earlier use. Downloads, ads and purchases also need a connection.
Faster fixes offline
Without data, the phone can't download assistance information that helps it find satellites quickly, so the first fix may take longer. Open the app outdoors a minute before setting off.
Travelling abroad
Abroad, mobile data roaming can be expensive or switched off. A GPS speedometer keeps working because satellites don't care about your SIM. If you want the map too, open the map over Wi-Fi at your hotel before you set off so tiles for the area may be cached, and switch the app to the local speed unit so it matches the signs.
Tips
Start on Wi-Fi, keep the app open, and keep the phone charged.
Related: Speedometer app features · How GPS speedometers work · Airplane speed app: measuring ground speed · Speedometer with map · GPS battery drain: how to reduce it · Speedometer without GPS: what works? · Speedometer app for iPhone · Speedometer app for Android
Get Speedometer PRO on Google Play · Download on the App Store · Set it up before you move; never handle your phone while driving.
Sources
- Assisted GNSS (Wikipedia): en.wikipedia.org (accessed 26 October 2026)
- Global Positioning System (Wikipedia): en.wikipedia.org (accessed 26 October 2026)
- Mapbox: mapbox.com (accessed 26 October 2026)
- Location and sensors (Android Developers): developer.android.com (accessed 26 October 2026)
FAQ
Does a speedometer work without internet?
Yes. GPS speed is calculated on your phone from satellite signals and does not need mobile data.
Does GPS work in airplane mode?
On most phones, yes, though some models behave differently. The first fix may be slower.
Will the map work offline?
Map tiles usually need data unless previously cached. Speed and distance still work.
Does Speedometer PRO need data?
Core speed readings work offline. Ads and map tiles may need data.
Can I use it abroad without roaming?
Yes, speed and distance work without a data connection.