He noted the latitude and longitude, then made a mark on the admiralty chart.他记下经度和纬度, 然后在航海图上作出标记。

50 degrees longitude经度50度

A similar feature is found at 13 degrees North between 30 degrees and 50 degrees longitude.在北纬13度、经度30度至50度之间的地方发现了相似的特征。