The sextant is the one most in use and so will be described first.
"Lectures in Navigation"
Ernest Gallaudet Draper
If, for instance, you can get a sight by sextant of the sun, you may be able to work out from this sight a very accurate calculation of what your latitude is.
"Lectures in Navigation"
Ernest Gallaudet Draper
Fortunately, I had also my pocket sextant, and with it took some valuable angles.
"Journal of an Expedition into the Interior of Tropical Australia In Search of a Route from Sydney to the Gulf of Carpentaria (1848) by Lt. Col. Sir Thomas Livingstone Mitchell Kt. D.C.L. (1792-1855) Surveyor-General of New South Wales"
Thomas Mitchell