For sea navigation, the Orcs of Doran Sheathe use a stone-worked embedded in the middle Phrax Ore with multiple others towards the rim. The orc ends up chanting something in Daraktan as it goes from 2D to 3D as one arm goes towards the middle and two circles elevate slightly. It shows, with her explanation, the rise & fall of the tide. Comparing notes, it does effectively the same thing as an Astrolabe but Phrax Ores as magnets to make a rudimentary compass.