Sextants and Accessories GPS is wonderful.  Yet, the prudent navigator knows that back-up navigation strategies are necessary.  We believe that a sextant is an integral component of any offshore navigator's toolkit.  There's also something magical about navigating in concert with the physical world around you--learning the heavens to steer by the stars. Astra IIIB Deluxe and IIIB Professional  The Astra IIIB revolutionizes celestial navigation:  never before has such a high-quality, accurate metal sextant been available at such a low price.  Tests by professional navigators produce results that rival the most expensive German and Japanese models.   Cassens and Plath Horizon Ultra The Horizon Ultra may be the most popular of the traditional brass sextants available today.  With superb accuracy, the finest construction, and a unique white finish for comfort, it's a favorite with serious offshore sailors.