# GPS Twin Odometers — historic, classic & vintage

> Dual odometers, clocks, and stopwatches for vintage road rallies. (iPhone/iPad app by MSYapps.)

- Source: https://appshunter.io/ios/app/gps-twin-odometers/id1366967175 (this page in markdown: same URL + `.md`)
- Developer: [MSYapps](https://appshunter.io/developer/458482419)
- Category: Sports, Navigation
- Price: $12.99
- Rating: 3.00/5 from 2 App Store ratings · 2 written reviews indexed
- Age rating: 4+
- Requires: iOS 13.6 · 1 MB
- Languages: American English
- Released: 2018-04-22
- Data updated: 2026-08-08
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/gps-twin-odometers/id1366967175/reviews.md

## What is GPS Twin Odometers?

Historic, Classic, or Vintage road rallies may permit digital dual odometers, clocks, and stopwatches. This app combines all three using timers and GPS devices built into Apple mobile devices.

GPS inputs are used strictly for distance measures along the rally route. Also, the displayed accuracy of two decimal places conforms to typical historic, classic, and vintage road rally restrictions. 

However, it is possible to interpolate distance to three decimal places. There are tick marks to indicate the second decimal place number centered on the display as well as increments of +0.0025, +0.0050, and +0.0075. When touched, the Control button will pause the two odometers for 4 seconds to allow you time to estimate distance to thousandths.

Similarly, time measurements are limited to whole seconds or cents. Time, distance, and mode (discussed below) may be chosen at the start of a new rally by touching the Set button to access app Settings.

A set of buttons allows you to chose the active odometer. The leftmost button activates the lower "interval distance" odometer; the rightmost button activates the upper "total distance" odometer; the center button activates both odometers.

From time to time you may measure time and distance for a stage or a checkpoint and record data by touching the Control button. The time and distance will be stored in a log along with geographic coordinates.

Distance options include subtraction of distance when you travel off course. Direction buttons switch between forward (+), reverse (–), and park (0). Also, you may chose between miles or kilometers.

There are three modes of operation selectable in the app Settings: Regularity mode, Jogularity mode, and Lap mode. In Regularity mode, the stopwatch will be reset to zero each time the Control button is pressed. In Jogularity mode the time split will be recorded but the stopwatch will continue recording. In Lap mode, the tabular display will reset the stopwatch to zero when the control button relabeled Lap Reset is touched and each split time will be identified as a Lap in the table. Also, in Lap mode, the options to zero either of the odometers are removed, however the lower odometer can be set to zero at the start of each lap by touching the Lap Reset button.

Note: Use of the GPS Twin Odometers during any particular rally will be subject to the rules and instructions governing the rally and may define your category or class among participants. Please consult the Rally Master for approval of the use of this app.

Disclaimer: Continued use of GPS running in the background can dramatically decrease battery life.

## Key features

- Dual odometers with two decimal place accuracy
- Integrated stopwatch and clock functions
- GPS-based distance measurement
- Three operational modes: Regularity, Jogularity, Lap
- Distance logging with geographic coordinates
- Option to subtract distance when off-course
- Choice between miles or kilometers

## Recent user reviews (2 of 2)

All indexed reviews: https://appshunter.io/ios/app/gps-twin-odometers/id1366967175/reviews.md

### 2/5 — Crashes immediately upon start with ios 16.

*2022-10-12*

Not much use until fixed.

### 4/5 — Needs a feature

*2022-02-05*

Needs feature to manually adjust clock to official rally clock. In cent watch you can adjust clock, can this be implemented for paid users?

## Frequently asked questions about GPS Twin Odometers

### What is GPS Twin Odometers used for?

GPS Twin Odometers is designed for historic, classic, and vintage road rallies. It provides dual odometers, clocks, and stopwatches to measure distance and time accurately along rally routes.

### How accurate is the distance measurement in GPS Twin Odometers?

The app displays distance accuracy to two decimal places, conforming to typical historic rally restrictions. It also allows for interpolation to three decimal places for finer measurement.

### What are the different modes available in GPS Twin Odometers?

GPS Twin Odometers offers three modes: Regularity mode resets the stopwatch each time a button is pressed, Jogularity mode records splits while the stopwatch continues, and Lap mode identifies splits as laps and resets the stopwatch for each.

### Can I log my rally data with GPS Twin Odometers?

Yes, you can measure time and distance for stages or checkpoints and record this data. The app stores this information in a log along with geographic coordinates.

### Does GPS Twin Odometers have ads?

No, GPS Twin Odometers does not contain advertisements. It is a paid application that offers an ad-free experience.

### What devices is GPS Twin Odometers compatible with?

GPS Twin Odometers is available for iPhone, iPad, and iPod devices. It requires iOS 11.0 or later.

### How often is GPS Twin Odometers updated?

The app was last updated on August 22, 2023, with version 2.4. Updates typically include bug fixes and performance improvements.

### What is the price of GPS Twin Odometers?

GPS Twin Odometers is a paid application priced at $12.99. There are no in-app purchases or subscription fees associated with its use.

## Version history (last 5 releases)

### 2.4 — 2023-08-22

- Removed support for third-party GPS receivers for improved operation, performance, and precision.
- Fixed fatal bug.

### 2.3 — 2022-07-27

- Enlarged the Stop and Control buttons for easier touching.
- Touching the Control button pauses the odometers to permit time to estimate distance by tick marks to thousandths of mile or kilometer.
- Fixed bug to zero the odometers that may have previously been adjusted.
- Reduced speed at which distance estimates between GPS signals are received to 5.5 mph.
- Removed the buttons that reset the stopwatch to zero and cleared the tabular results. These functions are available when the Reset, New Rally button is touched and accepted.
- In Lap mode, the options to zero either of the odometers are removed and the Control button has been relabeled Lap Reset to indicate that the lower odometer will be reset to zero whenever that button is touched to begin each new lap.
- Various GUI changes.
- Several bug fixes.

### 2.2 — 2022-07-22

- Major update to the Dual SDK version 2.2 that permits more effective data validation and Bluetooth connectivity. Thus, this app can now be used with iPads that do not have Cellular capability.
- Notable improvements in processing valid GPS data derived from Apple and Dual.
- Several GUI changes.

### 2.1 — 2021-09-16

- Updates to accommodate changes in iOS 13 and 14.
- Changes to accommodate formats of various iPhone and iPad displays.
- Minor code tweaks.
- Removed Facebook and Twitter links.

### 2.0 — 2018-07-30

This app has been updated by Apple to display the Apple Watch app icon.

- Added a continuously scrolling hundredth digit to each of the odometer displays. 
- With the scrolling digit display, it is possible to interpolate distance to three decimal places. There are tick marks to indicate the second decimal place number centered on the display as well as increments of +0.0025, +0.0050, and +0.0075.
- The color of active odometer displays now vary with the direction of travel and there is a direction of travel label between the two odometers. These two features have been added to make it easier to determine the active odometer and the direction of travel at a glance.
- To facilitate estimating distance to three decimal places and to smooth the scrolling, the app estimates distance traveled between GPS distance inputs at up to 16 times per second when moving at speeds of 15 mph or greater.
- In order to allow more time for the navigator to interpolate distance, the odometer displays are paused for 5 seconds whenever the Control button is touched.
- Some other GUI enhancements and minor bug fixes.

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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 2026-08-08.*