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click here GYRO ERROR.
click hereCostal_Nav
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click hereTraverseXL_V1
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click hereCompass-Deviation.-Conversion-of-Bearings
click hereCoordinates-Calculation
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click hereDetermining-compass-deviation-in-8-eight-courses–
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click hereDetermining-the-compass-deviation-using-reciprocal-bearings
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click hereDifference-of-Coordinates–
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click hereEcho-Sounder.-The-correction-of-depth
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click hereexcel_3d_maps
click hereExcel-Area-and-Volume-Calculator-1
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click hereHow-to-create-a-3D-Map-in-Excel
click hereLeading-line.-Leading-line-sensibility
click hereLength-of-one-minute-of-arc-of-Meridian-Equator
click hereMagnetic-Variation-or-Declination
click hereMap Chart samples
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click hereNavigation tools.SB 1.0
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click hereRhumb-line-in-the-Mercator-projection
click hereThe-Log.-General-knowledge-on-travelled-distance
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