You get it from a pirate that you talk to to start the trawler minigame
Use a sextant on runescape to get the location, you can get it at the observatory. And you can see it on runehq.com
Only for co-ordinate clues.
you talk to the man in a house near the observatory with you clue scroll in your inventory
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