A weather app that combines Apple Weather, Met Office and Open-Meteo to provide accurate weather readings using group average. It also provides the option to export the weather into NATO orders prelims format.

App Name Description

Flow Prelims is an operational field planning app built for users who need fast, accurate location, weather, grid, and timing information in one place. It combines live location data, multi-source weather, solar and lunar calculations, map-based prelim data, aviation weather, and structured orders workflows into a single field-ready workspace.

Designed for operational planning, navigation support, training, and briefing preparation, Flow Prelims helps you move from “where am I?” to “what does that mean for the task?” quickly. The app supports key coordinate formats including latitude/longitude, MGRS, and OSGB, provides address and altitude context, and presents weather using combined or source-specific views from Apple WeatherKit, Open-Meteo, and Met Office data.

Flow Prelims also includes astronomy and light-state tools for planning around first light, sunrise, sunset, last light, moon phase, and moon illumination. For aviation-aware users, the Forecast view can display METAR and TAF data with raw reports, decoded summaries, and nearest-airport resolution. When it is time to brief or record, you can save orders, attach weather and location data, and generate professional PDF exports and image outputs from within the app.

Whether you are preparing a ground brief, checking environmental conditions, validating a grid reference, or building a clean operational snapshot for later use, Flow Prelims keeps the critical information together and ready to use.

Key Features

·       Live dashboard with operational location, weather, wind, visibility, pressure, and timing data

·       Multi-source weather using Apple WeatherKit, Open-Meteo, and Met Office feeds

·       Combined weather mode plus source-specific viewing across the app

·       Coordinate support for latitude/longitude, MGRS, OSGB, and optional what3words (your own API key)

·       Address resolution, postcode support, and altitude display in metres and feet

·       Astronomy tools with first light, dawn, sunrise, sunset, last light, moon phase, and illumination

·       Forecast views for current, hourly, daily, and aviation weather

·       Aviation support with nearest-airport lookup, METAR, TAF, raw report display, and decoded summaries

·       Map prelim tools for selected locations with grid and weather context

·       Orders workflow for creating, saving, editing, archiving, and exporting structured operational orders

·       NATO sequence prelims - PDF and image export with configurable layouts, paper sizes, colours, and section controls

·       Diagnostics and readiness checks for weather sources, grids, astronomy, and external services

·       Theming and display customisation across the app

Marketing Statements

Primary Marketing Statement
Flow Prelims turns weather, grids, light-state, and operational planning into one clear field-ready picture.

Alternative Marketing Statements

·       One app for prelims, planning, grids, weather, astronomy, and orders.

·       Built for serious field users who need location intelligence, not just forecasts.

·       From live grid references to export-ready operational briefs, Flow Prelims keeps the full picture together.

·       Plan smarter with combined weather, accurate light-state timing, aviation context, and structured field orders.

Short App Store Promo Text
Operational weather, grids, astronomy, map prelims, aviation reports, and export-ready orders in one field planning app

Prelims – Privacy Policy

Last updated: 20 March 2026
Version: 1.0

1. Introduction

This Privacy Policy explains how Magnus North (“we”, “us”, “our”) collects, uses, discloses, and protects information when you use the Prelims mobile application (“Prelims”, “the App”).

By downloading, installing, or using Prelims, you agree to the collection and use of information in accordance with this Privacy Policy. If you do not agree, please do not use the App.

Magnus North is the data controller responsible for your personal data.
Magnus North operates as an individual developer based in the United Kingdom.

Contact details:

• Company: Magnus North

• Email: iosdevelopmentncl@gmail.com

We are committed to safeguarding the privacy and security of our users, even though no data is collected.

2. What Prelims Does

Prelims is a weather service app that:

• Retrieves weather data from third-party providers (including Apple Weather, the UK Met Office, and Open-Meteo) and combines these sources to provide an averaged or otherwise processed weather output for increased accuracy.

• Uses your device’s location to provide localised weather forecasts and related information.

• Provides NATO-style or NATO-standard inspired orders and weather-related products designed to assist users in military or military-adjacent roles in writing and delivery of NATO prelims orders.

The App is not an official product of NATO, any armed force, or any government organisation.

The App does not provide any information not publicly available.

The App does not require user account creation to function.

3. Legal Bases for Processing (UK GDPR / GDPR)

Where the UK General Data Protection Regulation (UK GDPR) or EU GDPR applies, we rely on the following legal bases:

• Consent:
  For example, when you allow access to your device’s location services.

• Legitimate interests:
  To operate, secure, maintain, and improve the App, including analytics and diagnostics, provided these interests are not overridden by your rights.

• Legal obligations:
  Where we must retain or disclose information to comply with applicable laws.

Data Type Mapping

• Location data → Consent

• Technical and usage data → Legitimate interests

• Support communications → Legitimate interests / Legal obligations

4. Information We Collect

We apply data minimisation principles and only collect data necessary to provide the App’s functionality.

4.1 Location Data

• Type: Approximate or precise location

• Source: Device GPS, Wi-Fi, Bluetooth, and/or network data

• Purpose: Provide localised weather forecasts and generate relevant outputs

You can control location permissions via your device settings. None of these data metrics go to the developer and are only used locally for the app to work.

4.2 Technical and Usage Data

If any issues provided as feedback - We may collect:

• Device model and OS version

• Language settings

• App usage interactions

• Crash logs and diagnostics

Purpose: App performance, stability, and improvement.

4.3 Weather-Related Inputs and Outputs

• Weather data from third-party providers

• User-selected or stored locations

• Generated reports and outputs

We do not intentionally associate this data with your identity.

4.4 Voluntary Communications

If you contact us:

• Email address

• Message content

• Attachments

Used solely for support and communication.

4.5 Data We Do Not Intentionally Collect

We do not intentionally collect:

• Names, addresses, or phone numbers

• Contacts, photos, or personal files

• Sensitive personal data

5. How We Use Your Information

We use data within the App to:

1. Provide core functionality

2. Generate NATO-style weather outputs

3. Improve app performance

4. Ensure security and prevent misuse

5. Comply with legal obligations

We do not use your data for advertising or marketing.

6. Third-Party Services and Data Sharing

6.1 Weather Providers Attribution

• Apple Weather

• UK Met Office

• Open-Meteo

These providers may receive:

• Location data

• IP address

• Technical request data

They act as independent data controllers unless otherwise stated.

6.2 Analytics and Diagnostics

We may use tools that collect:

• Device info

• Usage patterns

• Crash reports

Data is pseudonymised or aggregated where possible.

6.3 Service Providers

Third parties supporting app operation are bound by data protection obligations.

6.4 Legal Requirements

We may disclose data where required by law or to protect safety.

6.5 No Sale of Data

We do not sell, rent, or trade your personal data.

6.6 Tracking

We do not use tracking technologies for cross-app or cross-site advertising and do not use Apple’s App Tracking Transparency (ATT) framework.

7. International Transfers

Your data may be processed outside the UK.

Where required, we use safeguards such as:

• Standard Contractual Clauses (SCCs)

• UK International Data Transfer Agreement (IDTA)

• Adequacy regulations

8. Data Retention

We retain data only as necessary:

• Location data: Not stored beyond active session (or short-term caching <24 hours)

• Crash/diagnostic logs: Typically retained up to 90 days

• Support emails: Up to 12 months unless required longer

Data is deleted or anonymised when no longer needed.

9. Your Rights

You may have the right to:

• Access your data

• Correct inaccuracies

• Request deletion

• Restrict processing

• Object to processing

• Data portability

• Withdraw consent

Contact: iosdevelopmentncl@gmail.com

We may verify your identity before fulfilling requests.

Right to Complain

You have the right to lodge a complaint with the UK supervisory authority:

Information Commissioner’s Office (ICO)
Website: https://www.ico.org.uk

We encourage you to contact us first so we can resolve your concern.

10. Device Permissions

You can control permissions via device settings.

Disabling permissions may limit functionality.

11. Security

We implement appropriate technical and organisational measures, including:

• Secure communication protocols (e.g. HTTPS/TLS)

• Access controls

• Data minimisation

• Regular security reviews

However, no system is completely secure.

12. Automated Decision-Making

We do not carry out automated decision-making or profiling that produces legal or similarly significant effects.

13. Use in Military or Defence Contexts

• No requirement to provide military identity

• Users must follow OPSEC practices

• We are not responsible for sensitive data entered

• The app only provides a template for the NATO sequence of prelims (weather..)

This App is informational only and not an official military tool.

14. Children’s Privacy

Prelims is not directed at children under 13 (or applicable local age).

We do not knowingly collect children’s data.

15. Privacy Impact and Safeguards

We recognise that location data can be sensitive and have implemented safeguards including:

• Data minimisation

• Limited retention

• No identity linking

• User-controlled permissions

16. Changes to This Policy

We may update this policy periodically.

Changes will be reflected by updating the “Last updated” date.

17. Contact Us

• Email: iosdevelopmentncl@gmail.com

• Company: Magnus North

We will respond within a reasonable timeframe.

17. Attribution

Weather is collected by third party API's.

• Weather is provided through API's by Apple Weather (https://developer.apple.com/documentation/weatherkitrestapi/), Met Office (https://www.metoffice.gov.uk) and Open-Meteo (https://open-meteo.com).

• Aviation weather is provided through API's by NOAA (https://aviationweather.gov), CheckWX (https://www.checkwxapi.com_, and AVWX (https://info.avwx.rest)