Speedometer User Manual (NAS Web Version)

1. App Introduction

Speedometer is a clean, glanceable dashboard designed to show your GPS-based speed in a big, readable layout, plus a compass and altitude for quick reference—great for driving, cycling, and outdoor activities.

Highlights

True GPS speed: computed from your device’s location data (not inferred from Wi‑Fi/IP).
Large speed digits: designed for easy readability at a glance.
Compass: intuitive orientation with a fixed needle and rotating scale (depends on sensors/motion).
Altitude: displayed with smoothing to reduce visual jitter.
Metric / Imperial: km/h & m or mph & ft.
Keep screen awake (optional): prevents the screen from turning off while using the app.

Safety note

Do not rely on this app as your only navigation source. Drive safely and follow local laws.
GPS accuracy varies by environment (tunnels, tall buildings, trees, weather, device quality).

2. Install & First Launch

Install the app from Google Play.
On first launch, grant Location permission (required for speed/altitude/heading).
For best results, test outdoors in an open area so GPS can lock quickly and readings stabilize.

3. Permissions

Location (required): Used to calculate GPS speed, altitude, and compass/heading behavior.
Keep screen awake (optional): Keeps the screen on while the app is open to prevent sleep during long use.

4. Quick UI Tour

(Screenshot placeholder)
Drop your app screenshots here (Speed + Compass + Altitude).

Common on-screen fields

Speed: large digits, usually centered.
Units: km/h or mph.
Compass: indicates heading/north reference depending on sensors and movement.
Altitude: current elevation with smoothing.

5. How to Use (by scenario)

Driving / Riding

Mount your phone safely (do not block your view).
Wait a moment for GPS to stabilize.
Enable “Keep screen awake” if available to prevent screen timeout.

Hiking / Travel

Open areas give more stable speed/altitude updates.
If the compass looks off, try a figure‑8 calibration or restart the app (see Troubleshooting).

6. Units (Metric / Imperial)

The app supports Metric (km/h & m) and Imperial (mph & ft). If you have a settings page or toggle button, add a screenshot and exact steps here.

(Screenshot placeholder)
Settings screen: units + keep-awake option.

7. Accuracy & Stability Tips

Location mode: “High accuracy” (GPS + network) typically works best on Android.
Environment: tunnels/parking garages/high-rises/trees can reduce GPS quality.
Inside a vehicle: near the windshield often improves satellite reception.
Low speed: GPS speed may fluctuate more at very low speeds—this is normal.
Altitude: GPS altitude naturally varies; smoothing helps but small fluctuations are expected.

8. Ads (AdMob)

This app uses Google AdMob to show ads. Depending on AdMob settings, device identifiers may be used for ad delivery and measurement. If you host this manual on your NAS, it’s recommended to also link your privacy policy page.

9. Troubleshooting

Speed stays at 0 / does not update

Make sure Location is enabled and permission is granted.
Go outdoors and wait 10–30 seconds for GPS to lock.
Enable “High accuracy” location mode in Android settings if available.

Compass is inaccurate or jumps a lot

Move away from magnetic interference (magnetic mounts, speakers, metal objects).
Do a figure‑8 calibration motion for a few seconds.
Heading may be unstable when stationary/very slow; it usually improves while moving.

Altitude fluctuates heavily

GPS altitude is sensitive to signal quality; open areas are more stable.
Indoor/high-rise/valley environments often cause larger fluctuations.

Screen dims / locks while using the app

Enable “Keep screen awake” (if your build includes it).
Or temporarily increase Android’s screen timeout duration.

Ad area causes layout “jumping” or overlaps content

Reserve bottom padding equal to the banner height.
If you show ads only in specific states (e.g., when speed is 0), document it here.

10. FAQ

Why is this speed different from my car’s speedometer?

Both can have error. Car speedometers often read slightly high, while GPS depends on signal quality. Differences are normal.

Why are readings unstable right after launch?

GPS needs time to lock and stabilize, and sensors may settle. It usually becomes steady after moving outdoors for a bit.

Does the app collect my personal data?

Check the app’s Data Safety section on Google Play. Ads are provided via AdMob which may use device identifiers for ads/measurement.

11. Support & Contact

Support email: 801184@gmail.com
Developer email: brucechohome@gmail.com
Privacy policy: 801184.diskstation.me

Important: Never operate your phone while driving. Adjust settings only when safely parked, or let a passenger operate it.