分析表明，精度优于《航海天文历》。
The precision analysis indicates that its precision is much higher than that of "Nautical Almanac".
利用《航海天文历》查表的方法来获得罗经差的计算过程比较复杂。
The procedures and its analyses to determine compass error by GPS at sea;
利用《航海天文历》查表的方法求取高度差法两要素，过程比较复杂。
It is complex to get the two factors in altitude difference method by consulting the "nautical almanac".
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