Free Online Compass — Live Direction & Navigation Instrument

Open compassonlinefree.com in any modern web browser on your smartphone. The compass activates automatically; on iOS (iPhone), tap the dial once when prompted to grant DeviceOrientation sensor permission. Hold your smartphone flat in the palm of your hand like a physical compass, step away from magnetic objects, and read your live numeric bearing and cardinal direction directly beneath the top alignment lubber line.

A digital compass reads your smartphone's internal MEMS (Micro-Electro-Mechanical Systems) magnetometer—a tiny silicon microchip containing Hall-effect or magnetoresistive sensors. The chip detects the microtesla intensity of Earth's geomagnetic field across three perpendicular axes (X, Y, Z). Software algorithms fuse these magnetic signals with gravitational data from the phone's 3-axis accelerometer to compensate for device tilt, resolving your exact 0°–360° heading in real time.

Yes. Once calibrated, a smartphone's solid-state magnetometer typically achieves an accuracy of ±2° to ±5° in quiet magnetic environments, which is comparable to handheld liquid-filled recreational baseplate compasses. However, because smartphones contain internal speakers, batteries, and metallic casings, regular recalibration with a figure-8 motion is essential to counteract internal soft-iron and hard-iron bias.

An unstable or inaccurate needle is almost always caused by localized magnetic interference. Common culprits include steel-reinforced concrete floors, metal laptop chassis, magnetic phone cases (such as MagSafe wallets or magnetic car mounts), nearby electrical appliances, or uncalibrated sensor drift. Move to an open area, remove magnetic accessories, and perform a slow figure-8 calibration wave.

Hold the smartphone firmly in your hand and trace a wide, smooth figure-8 pattern in the air for 5 to 10 seconds, tilting and rolling the device as you sweep. This motion exposes all three sensor axes to Earth's ambient magnetic vector, allowing the phone's sensor fusion algorithm to calculate and subtract localized hard-iron and soft-iron magnetic offsets.

True North (Geographic North) represents the fixed rotational axis of planet Earth at 90°N latitude where all longitudinal meridian lines converge. Magnetic North is the dynamic location in the Arctic where Earth's geomagnetic flux lines point vertically into the ground. The angular difference between them at any specific geographic coordinate is called magnetic declination (or variation).

Smartphones measure Magnetic North directly. To find True North, identify your local magnetic declination from a topographic map or geological survey (NOAA/BGS). If your declination is East (positive), True North lies that many degrees counter-clockwise from your needle. If your declination is West (negative), True North lies clockwise. Formula: True Heading = Magnetic Heading + Declination.

Yes. After loading compassonlinefree.com once in your browser, modern browser caching (service workers and cached assets) stores the entire application locally on your device. The magnetometer and accelerometer hardware operate completely client-side without pinging any external server, allowing uninterrupted navigation even in deep backcountry wilderness without cellular signal.

Look up your city's great-circle Qibla azimuth angle (for example, 119° in London, 058° in New York, or 279° in Mumbai). Open Compass Online, calibrate your phone away from metal, and rotate your body until the top lubber line displays your city's exact target bearing. The front edge of your phone is now pointing along the great-circle orthodrome directly toward the Kaaba in Mecca.

Stand on your balcony or in front of your exterior window with your back to the interior room, looking outward. Open Compass Online, hold your phone level at chest height, and point the top of the device straight toward the view outside. The reading under the top marker indicates your balcony's exposure: 338°–022° is North, 068°–112° is East, 158°–202° is South, and 248°–292° is West.

In the Northern Hemisphere, fixed photovoltaic solar panels should face True South (180° true azimuth) for maximum annual kWh production. Because your compass reads Magnetic South, subtract local East declination or add West declination to find your magnetic target. For example, in an area with +14° East declination, align your solar racks to 166° on your compass dial.

The 16-point compass rose divides the 360° circle into 22.5° increments: North (000°), North-Northeast (022.5°), Northeast (045°), East-Northeast (067.5°), East (090°), East-Southeast (112.5°), Southeast (135°), South-Southeast (157.5°), South (180°), South-Southwest (202.5°), Southwest (225°), West-Southwest (247.5°), West (270°), West-Northwest (292.5°), Northwest (315°), and North-Northwest (337.5°).

Never. Compass Online processes raw sensor events (alpha, beta, gamma Euler angles) entirely on-device within your browser sandbox. No sensor coordinates, orientation angles, IP tracking data, or personal identifiers are transmitted to our servers or third parties. Your navigation remains 100% private.

Standard desktop PCs and laptop workstations lack internal triaxial magnetometers and accelerometers. When Compass Online detects that your hardware lacks motion sensors, it automatically activates an interactive interactive demo mode allowing you to rotate the dial using your mouse drag or keyboard arrow keys for educational exploration.

Lay your map flat, align the compass edge between your current location and destination, rotate the bezel until orienting lines match the map's north-south grid lines, add or subtract local magnetic declination, and then hold the compass flat, turning your body until the magnetic needle sits inside the orienting arrow ('put red in the bed'). Walk along the direction-of-travel line.

Ferromagnetic metals and active electromagnetic emitters distort compass readings. Common offenders include steel structural rebar in concrete, car chassis, iron railings, electric motors, induction cooktops, audio speakers, and magnetic smartphone cases. Maintain at least 2 to 6 feet of separation from metal fixtures for clean readings.