# Privus: inertial navigation — Determine speed and distance

> Estimates speed and distance using phone's inertial sensors. (iPhone/iPad app by Tomas Batek.)

- Source: https://appshunter.io/ios/app/privus-inertial-navigation/id1563992443 (this page in markdown: same URL + `.md`)
- Developer: [Tomas Batek](https://appshunter.io/developer/1563625609)
- Category: Utilities, Education
- Price: Free
- Rating: 3.33/5 from 3 App Store ratings · 3 written reviews indexed
- Age rating: 4+
- Requires: iOS 12.1 · 8 MB
- Languages: English
- Released: 2021-04-27
- Data updated: 2026-06-05
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/privus-inertial-navigation/id1563992443/reviews.md

## What is Privus?

This application was created for a school project 'Mobile Inertial Navigation'.

The purpose of the app is to count velocity and distance only from the phone's inertial system - the accelerometer and the gyroscope. However, the measurements are rather inaccurate, because these sensors are not designed for this kind of use.

## Key features

- Measures velocity
- Calculates distance
- Utilizes accelerometer
- Uses gyroscope
- School project origin

## Recent user reviews (3 of 3)

All indexed reviews: https://appshunter.io/ios/app/privus-inertial-navigation/id1563992443/reviews.md

### 1/5 — Very inaccurate

*2024-11-24*

It says I’m infinitely going down, huh? This doesn’t work

### 4/5 — Inertial measurement

*2024-02-18*

Really great to see this app, and very useful for demonstrating how errors in inertial measurement develop.
Thank you for developing and publishing it!
Possible areas for improvement
Have separate information for each sensor eg accelerometer x, y, z, and gyro x,y,z.
Have more precision on acceleration display (with the ability to apply a low pass filter to remove high frequency noise)

### 4/5 — It’s a nice idea

*2024-01-15*

Too bad the iPhone doesn’t have all the sensors needed.  I wonder if you could use GPS for calibration.

## Frequently asked questions about Privus

### What is Privus?

Privus is a mobile application designed to estimate speed and distance traveled solely by using the phone's built-in inertial sensors, specifically the accelerometer and gyroscope. It was developed as part of a school project focused on mobile inertial navigation.

### How accurate is Privus?

The measurements provided by Privus are noted as rather inaccurate. This is because the phone's inertial sensors are not primarily designed for precise velocity and distance calculations, leading to potential discrepancies in readings.

### What devices does Privus support?

Privus is available for iPhone and iPod devices. It leverages the specific sensor hardware present on these Apple mobile devices.

### What is the age rating for Privus?

Privus has an age rating of 4+, indicating it is suitable for users of all ages. The app's functionality does not involve mature or inappropriate content.

### When was Privus last updated?

Privus was last updated on April 27, 2021, with version 1.0. The application has not received updates since its initial release date.

### Does Privus have ads?

No, Privus does not contain advertisements. As indicated by its data, the application is ad-free, providing an uninterrupted user experience.

### What is the price of Privus?

Privus is available for free. There are no costs associated with downloading or using the application.

### What sensors does Privus use?

Privus utilizes the phone's inertial system, specifically the accelerometer and the gyroscope, to determine speed and distance. These sensors provide raw data that the app processes for its calculations.

## Version history (last 1 release)

### 1.0 — 2021-04-27

No release notes.

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| --- | --- | --- | --- |
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## More apps by Tomas Batek

- [Party: social games](https://appshunter.io/ios/app/party-social-games/id1563625607)

All apps by Tomas Batek: https://appshunter.io/developer/1563625609

## Related topics

[inertial](https://appshunter.io/ios/topics/inertial)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-05.*