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Sextant Mark 1 Ilon Price Shocks The Market
Only one on ebay !!!! It offers great value for anyone serious about navigation. Discover high-quality marine sextants for celestial navigation. 除了测量量程不一样,没什么区别。 八分仪 是圆周八分之一45度,量程乘以二是90度。 六分仪是圆周六分之一60度,...