Abstract
With the principle, methods and steps of calculating compass error from observing the low height sun azimuth, the software program about calculating compass error based on VB (Visual Basic) environment has been given out. By analyzing the data regularity of Nautical Almanac, get the result that the data of Nautical Almanac shows the pattern of an arithmetic series, then with the data regularity and Compass Error’s calculating formula, a perfect software of calculating Compass Error is designed with Computer language Visual Basic. The data from observation and given can be put into the software program directly, avoid the complex of table lookup and data calculation, the software program has great effect to reduce the amount of calculation and raise the speed, precision and accuracy of calculating compass error.
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