The Downsizing Doula

The Astra IIIB is one of the world's most popular marine sextants. Known for offering the precision and features of high-end German and Japanese instruments at roughly a third of the cost, it typically retails for between $999 and $1,200 brand new. Key Specifications & Features, Frame: Lightweight, corrosion-resistant aluminum alloy, weighing about 2.6 lbs.Measuring Range: -5° to +130° on a 153mm radius arc.Accuracy: ± 20 arcseconds throughout the arc.Micrometer Drum: 1' scale, with a vernier reading to 0.2'.Optics: Standard 3.5x40 monocular telescope; a 7x35 scope is also available for enhancing sun/moon sights.