Mk 25 Sextant
This top of the line plastic sextant features a full-field Beam Converger™ mirror, sometimes referred to as a "full horizon mirror". This replaces the conventional half-silvered mirror and means the horizon and astrobody images are combined in a single full-field for easy, reliable sights under the most difficult conditions.
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 frame is made of reinforced plastic which stiffens the unit for greater measurement accuracy.
The Mark 25 is illuminated by a High-efficiency LED, which floods the arc and drum with soft light. There is a positive "push-on" switching action, with vinyl boot water protection, and batteries are included.
Supplied with a foam-lined carrying case and instruction booklet.