Why does my browser request motion sensor permissions on iPhone?

iOS Safari requires explicit user gesture permission to access the DeviceOrientationEvent sensor stream to protect privacy and prevent passive fingerprinting.

What is magnetic declination and why does it matter?

Magnetic declination (also called magnetic variation) is the angle between Magnetic North (where a compass needle points) and True Geographic North (the North Pole). Depending on your global location, declination can deviate by 20° or more.

How does the tool know my local magnetic declination?

Using your approximate GPS latitude and longitude, the tool references the World Magnetic Model (WMM) coefficients to compute the exact degree offset for your geographic coordinates.

Why does the compass needle jitter indoors or near metal?

Smartphones use Hall-effect magnetometers susceptible to local magnetic distortion from structural steel, laptop speakers, wireless chargers, and power lines. Moving outdoors resolves local magnetic interference.

Does this compass work offline without an internet connection?

Yes. Once the page is loaded in your browser cache, the DeviceOrientation sensor API executes entirely client-side on your device hardware without requiring an internet connection.

Mobile & Tech

Live Browser Sensor Compass, Magnetic Declination & True North Heading

Name: Live Browser Sensor Compass, Magnetic Declination & True North Heading
Author: AnshuTechy

Access live device magnetometer sensors in your browser with real-time digital compass rose visualization, magnetic declination lookup, True North azimuth conversion, and GPS coordinate tracking.Documentation & FAQs ↓

Live Browser Sensor Compass, Magnetic Declination & True North Heading — Interactive Console

Runs locally in your browser • Instant output

Sensor Compass, Magnetic Declination & Heading Studio

Hardware orientation API compass rose, NOAA magnetic declination correction, great-circle azimuth & relative steering cue.

True Heading:54.5° NE

Aviation 360° Compass Rose DialManual Slider Mode

MANUAL HEADING ROTATION42° Magnetic

NOAA Magnetic Declination Correction

LOCAL DECLINATION (DEGREES)

HEMISPHERE DIRECTION

World Magnetic Model Presets

Waypoint Bearing & Geodesic Steering

CURRENT POSITION (LAT/LON)

37.7749° N, -122.4194° W

TARGET: Tokyo, Japan

35.6762° N, 139.6503° E

STEERING GUIDANCE

TURN LEFT 111°

Target Azimuth: 303.4°

8,275 km (5,142 mi)

Step-by-Step Instructions

4 Steps to Completion

1Phase 1

Grant Device Orientation and Geolocation sensor permissions when prompted by your mobile browser.

2Phase 2

Hold your smartphone flat horizontally; wave the device in a figure-8 motion if calibration is requested.

3Phase 3

Observe the rotating compass rose showing your live heading in degrees azimuth.

4Phase 4

Toggle 'True North' to automatically incorporate your local GPS magnetic declination offset.

Practical Use Cases & Real-World Scenarios

Field Navigation & Topographic Map Alignment

Align paper topo maps to True North in remote terrain using your mobile phone browser without downloading native app bloatware.

Solar Panel & Satellite Dish Aiming

Orient residential photovoltaic solar arrays and satellite dishes toward exact solar south or azimuth coordinates for peak efficiency.

Interior Feng Shui & Architecture Layouts

Determine room orientations, entrance headings, and window sun angles during property site surveys and architectural walk-throughs.

Related Editorial Guide on AnshuTechy10 Best Compass Apps for Android and iPhone in 2026

Read Tutorial →

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100% free, private in-browser utility with zero server uploads.

Live Browser Sensor Compass, Magnetic Declination & True North Heading

Sensor Compass, Magnetic Declination & Heading Studio

Step-by-Step Instructions

Practical Use Cases & Real-World Scenarios

DeviceOrientation & Magnetometer API Sensor

Magnetic Declination True North Offset

Cardinal & Azimuth Degree Readouts

Sensor Calibration & Accuracy Feedback

Frequently Asked Questions

10 Best Compass Apps for Android and iPhone in 2026

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