| It represents the octant, a navigational instrument that was replaced by the sextant in the latter half of the 18th century. |
| The arc was extended from an octant to a sextant and a stout handle was added at the back of the instrument. |
| Celestial navigation used a sextant built right into the cockpit but if the plane was wallowing at all, it was useless. |
| In the afternoon we hove to and tried to get the boat still enough for Ken to shoot the sun with a sextant. |
| The instruments used in taking observations for latitude may be either a sextant and an artificial horizon, or a small theodolite. |
| Behind him, he towed a raft outfitted with a coffin-size sleeping compartment and carrying fishing tackle, compass, sextant, and three portable water desalinators. |
