On that month-long trip he carried no compass , sextant or charts .
一个月的旅行，罗盘、六分仪、海图，什么都没带。
Imagine trying to deduce this with the naked eye , a sextant and little else .
试想一下仅用肉眼观测、一台六分仪和其他小仪器的帮助下就来推断的困难吧。
U.s. navy working brandis & sons sextant .
美国海军工作布兰迪斯父子六分仪。
He plays with an astrolabe and sextant , but , with characteristic excess , almost contracts sunstroke " from trying to establish an exact method to ascertain noon . "
