Sextant Parts
Sextant Parts are used to create a Sextant using the Tinkering skill. Sextant parts are also created using the Tinkering skill with four ingots, or can be purchased from an NPC Tinker in some towns.
An amusing thing to note is that while it takes 30.0 Tinkering skill to create the sextant parts, it requires no points in Tinkering skill to then create the sextant itself.