Naval overseer was a rank within the Galactic Empire's naval forces. Those who held the rank oversaw fleet actions along a specific route and staged the fleet for various maneuvers.
Then-Captain Sander Delvardus lobbied to become the naval overseer under Grand Moff Ardus Kaine for the Rimma Trade Route, largely because he wanted to be stationed near Clak'dor VII, where his mistress, Seledra-Zin, was staying.
Sources[]
The Imperial Warlords: Despoilers of an Empire, Part 2 on StarWars.com (article) (content now obsolete; backup link)