RangeCalc - Full Triangulation Edition

A modern, offline-capable Progressive Web App (PWA) for calculating range to a target using two compass bearings.

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✨ Features

• Simple Mode — Fast calculation using the classic cotangent method
• Full Triangulation Mode — More accurate calculation using Law of Sines
• Baseline Bearing Input — Maximum accuracy when you provide the direction from Ref1 to Ref2
• Responsive Modern UI — Works great on phones and tablets
• Dark / Light Mode — Automatic or manual toggle
• Calculation History — View previous results
• Offline Support — Installable as a real app (PWA)
• No Installation Required — Works directly in any modern browser

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How to Use

1. Open the app in Chrome (or any modern browser)
2. Enter:
   • Bearing from Ref One to Target
   • Bearing from Ref Two to Target
   • Baseline Distance (meters)
3. Choose calculation method:
   • Simple → Quick field estimate
   • Full Triangulation → Enter Baseline Bearing (direction from Ref1 → Ref2) for best accuracy
4. Tap Calculate
5. View results from both reference points + angle at target

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Installation (Recommended)

As a Progressive Web App (PWA)

1. Open the app in Chrome on your Android phone
2. Tap the three-dot menu → “Add to Home screen” (or “Install app”)
3. Name it “Range Calculator” and tap Add

The app will now appear as a native-like icon on your home screen and works offline.

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Files

• index.html — Single-file standalone version (recommended)
• styles.min.css — (Optional) Custom styling

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Technical Details

• Built with HTML5 + Bootstrap 5 + Vanilla JavaScript
• Uses Law of Sines for Full Triangulation
• Fully client-side (no server or data collection)
• Progressive Web App (PWA) with service worker for offline use

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Author

John Dovey

• Email: dovey.john@gmail.com
• GitHub: JohnDovey
• Original Project: RangeCalc

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License

This project is open source and free to use. Feel free to modify and distribute.

If you find it useful in the field, consider donating via PayPal — every bit helps!

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Screenshots

• None yet

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Made with ❤️ for field use, surveying, and outdoor enthusiasts.