The Confirmation Method and Its Accuracy Analysis of Short Side's True North Bearing in Island Reef Geomagnetic Survey

The calculation method of GPS short side's true north bearing was discussed,the azimuth angle survey accuracy of the short side was also analyzed in the paper.According to the island reef geomagnetic survey work experience,some methods and advice of short side's true north bearing survey were summarized.The experimental results show that the efficiency of geomagnetic survey is enhanced.