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Building a Qibla Finder in Flutter: Bearing Math and Compass Handling

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A developer who built a Qibla finder for the Punj Surah app explains that the feature involves two main challenges: calculating the bearing to the Kaaba and reading the device compass smoothly. The guide demonstrates computing the great-circle bearing using plain Dart math, since a flat-map line is inaccurate over long distances. It then shows how the flutter_compass plugin streams heading data, with an emphasis on handling null values on devices lacking a magnetometer. The article also notes that compass readings report magnetic rather than true north, so developers should account for magnetic declination. Finally, it warns that raw sensor data is noisy and needs smoothing before being shown on a rotating dial.

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