# Local Scale Factor — Local Scale Factor tool

> Calculates local scale factor and Cartesian coordinates from GPS positions. (iPhone/iPad app by NRG Surveys Ltd.)

- Source: https://appshunter.io/ios/app/local-scale-factor/id1353822948 (this page in markdown: same URL + `.md`)
- Developer: [NRG Surveys Ltd](https://appshunter.io/developer/1334623382)
- Category: Utilities, Navigation
- Price: Free
- Age rating: 4+
- Requires: iOS 10.3 · 65 MB
- Released: 2018-07-23
- Data updated: 2026-06-11
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/local-scale-factor/id1353822948/reviews.md

## What is Local Scale Factor?

For professional surveyors and geodesists who need to know the local scale factor and Cartesian coordinates based on WGS84 GPS positions

Hundreds of local grid transformations built in. A full list of available transformations can be found at https://www.nrgsurveys.co.uk/wp-content/uploads/transformations.txt

Converts latitude and longitude using local ellipsoid parameters and Helmert 7 step transformations

As a bonus it converts local postcodes to geodetic positions and vice versa

Open Maps navigation to the selected coordinates (If available)

## Key features

- Local scale factor calculation
- Cartesian coordinate conversion
- WGS84 GPS position input
- Local grid transformations
- Postcode to geodetic position conversion
- Map navigation

## Recent user reviews (3 of 3)

All indexed reviews: https://appshunter.io/ios/app/local-scale-factor/id1353822948/reviews.md

### 5/5 — Perfect!

*2025-05-28, version 1.9*

I have used this App many times over the years and found it be invaluable to discover why local grids don’t match OS ones! Clear and easy to use. Perfect for any UK surveyor.

### 5/5 — Another cracker!

*2018-12-06, version 1.4*

Exactly what’s needed and just works!

### 5/5 — Excellent App

*2018-05-27, version 1.0*

Does exactly what it says it will.

## Frequently asked questions about Local Scale Factor

### What is the primary function of Local Scale Factor?

Local Scale Factor calculates the local scale factor and Cartesian coordinates from WGS84 GPS positions. It also converts between local postcodes and geodetic positions, and offers map navigation.

### What types of transformations does Local Scale Factor support?

The tool includes hundreds of local grid transformations, utilizing local ellipsoid parameters and Helmert 7 step transformations for accurate conversions.

### Is Local Scale Factor available on Android devices?

Based on the provided data, Local Scale Factor is available on iPhone, iPad, and iPod. Compatibility with Android devices is not specified.

### How frequently is Local Scale Factor updated?

The app was last updated on June 12, 2019, with version 1.9. The release date was July 23, 2018, indicating a development history.

### What is the age rating for Local Scale Factor?

Local Scale Factor has an age rating of 4+, making it suitable for a wide range of users.

### Does Local Scale Factor have ads?

No, Local Scale Factor does not contain advertisements. The app is free to use without any ad interruptions.

### Can Local Scale Factor be used offline?

The description does not explicitly state offline capabilities. However, core calculation features may function without an internet connection, while map navigation would likely require it.

### Where can I find a list of supported transformations for Local Scale Factor?

A comprehensive list of available local grid transformations can be found at https://www.nrgsurveys.co.uk/wp-content/uploads/transformations.txt.

## Version history (last 5 releases)

### 1.9 — 2019-06-12

Added localisation support for decimal places.

### 1.4 — 2018-07-27

Minor bug fixes.

### 1.3 — 2018-06-15

Added ability to select between multiple transformations.
Added support for hundreds of local grid transformations. A full list of available transformations can be found at: https://www.nrgsurveys.co.uk/wp-content/uploads/transformations.txt

### 1.2 — 2018-06-15

Added ability to select between multiple transformations.
Added support for hundreds of local grid transformations. A full list of available transformations can be found at: https://www.nrgsurveys.co.uk/wp-content/uploads/transformations.txt

### 1.0 — 2018-03-02

No release notes.

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## More apps by NRG Surveys Ltd

- [Alignment Viewer](https://appshunter.io/ios/app/alignment-viewer/id1334623383)

All apps by NRG Surveys Ltd: https://appshunter.io/developer/1334623382

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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 2026-06-11.*