Experience navigators will know that this shirt is straight out of Bowditch!
For those still learning how to manipulate a sextant, the Horizon System of Coordinates is a system based upon the celestial horizon as the primary great circle and a series of secondary vertical circles which are great circles through the zenith and nadir of the observer and hence perpendicular to his horizon. It is used by blue water navigators to locate a ship's position upon the ocean.
- 100% Fine Ring-Spun Cotton, 4.2 oz. - Hand-Finished in the good ol' USA, Sweatshop Free!
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