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Compass Variation and Deviation - how to calculate them - Building The Best Powerboat Company In Britain
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Magnetic Declination - Land Surveyors Dictionary - Land Surveyors United - Global Surveying Community
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Compass Variation and Deviation - how to calculate them - Building The Best Powerboat Company In Britain
Magnetic Declination - Land Surveyors Dictionary - Land Surveyors United - Global Surveying Community
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