Being a navel instrument it would normally be bought from Sailing outlets
GPS? The Sextant has not been replaced they are still available to buy new and are carried on every commercial vessel.
you can find sextant on history.com
you use a sextant to navigate.
you draw a sextant by looking at googler in the images.
the sextant helped me navagate my way to alaska
as sextant consists a graduated circular arc that is of 60 degree so, arc forms one-sixth of a circle ,hence the name sextant
how many years that the sextant become a symbol of navigation
John Hadley and Thomas Godfrey independently built the octant (which became the sextant later)
The sextant
The sextant
Yes Christopher Columbus did use a sextant along with a compass, ampoletta, and a cross staff.
A sextant