| Possible sources of interference affecting magnetic field sender (compass) |
| Sources of interference in or on vehicle: |
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| Magnetic/metallic items (e.g. bicycle, tool box, ladder, steel rims, etc.) in vehicle |
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| Magnetic/metallic items on roof or roof rack |
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| Signs, number plates, aerials and other items with magnetic bases |
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| Seat backrest folded down |
| Sources of interference outside vehicle: |
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| Industrial facilities (e.g. electroplating factories) |
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| Goods vehicles with metallic load |
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