Davis Mark 3 Sextant 11, Celestial Navigation 132, Artificial Horizon 144 Bundle (3 Items). The Mark 3 is a plastic training sextant that comes with an instruction booklet. The 132 is a complete Celestial Navigation System Chart including Sextant Use and Corrections. The Artificial Horizon comes with 2 sun shades, lid and full directions. Great for backyard practice.