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Thread: Compass card-why bother?
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Old 17th Jun 2006, 11:52
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stevef
 
Join Date: Feb 2006
Location: Station 42
Age: 69
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The swing interval is 36 months unless there have been engine changes, lightning strikes or certain electrical modifications. Like Aerocat says, badly-placed magnetic items or the field from electrical circuits will have an effect on the readings.
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