Davis Instruments Mark 25 Sextant,六分仪

马克3六分仪 

有时也被称为“救生艇”六分仪，马克3是一种廉价的培训六分仪。然而，这种模式已在世界各地的水手。它是全尺寸的，具有遮阳，但没有光学放大倍数，以帮助您找到昏暗的天体。

马克15六分仪 

这种模式有很多强大的功能，包括7大遮阳伞，3毫米X 27毫米口径的星范围，且易于阅读的测微鼓的游标刻度读取到一分钟的2月10日。马克15具有7“（18 cm）画框半径毕业于120度到-5度，并配有传统的半镀银镜。

马克25六分仪 

该行戴维斯塑料六分仪的顶部，马克25我们的特色束会聚器™镜，有时也被称为“全视界镜子”。一个特殊的涂层被施加到高品质的光学玻璃，以允许用户看到通过该反射镜，但仍然拾取图像作为微弱的低光分。标记25是由一个长寿命的LED，并提出一个升级的塑料，这是非常稳定的照明。

Mark 3 Sextant
Sometimes referred to as a "lifeboat" sextant, the Mark 3 is an inexpensive training sextant. Yet this model has taken sailors around the world. It is full-sized and has sunshades, but no optical magnification to help you find dim celestial bodies.

Mark 15 Sextant
This model has many great features including seven large sunshades, a 3 mm x 27 mm star scope, and easy-to-read micrometer drum vernier scale that reads to 2/10 of a minute. The Mark 15 has a 7" (18 cm) frame radius graduated from 120 degrees to -5 degrees and comes with a traditional half-silvered mirror.

Mark 25 Sextant
The top of the line Davis plastic sextant, the Mark 25 features our Beam Converger^™ mirror, sometimes referred to as a "full horizon mirror". A special coating is applied to high quality optical glass to allow the user to see through this mirror, yet still pick up images as faint as low-light stars. The Mark 25 is illuminated by a long-life LED and made of an upgraded plastic that is very stable.