Rugged, Full-Sized Entry Level Instrument
Sometimes referred to as a "lifeboat" sextant, the Mark 3 is an inexpensive training sextant - yet this model has taken sailors around the world, too!
It has a full 7" arc and 4 sunshades, but no optical magnification to help you find dim celestial bodies
Corrosion-proof plastic; reads to within 2 minutes of arc
Comes with instruction booklet