navigational dividers

Day 1: Interview Jay Wilmington about navigational dividers.

The object was "a fragment of copper alloy identified as being from a pair of navigational dividers" dating from the early 18th (or late 17th) century.

Inside, there was an expensive clutter of ships-in-bottles, shiny brass telescopes, sextants, demi-culverins, grappling hooks, navigational dividers, paintings, and prints.

He attacks Catherine who tries to defend herself with the navigational dividers she stole from Jay's barge, however Trevor manages to get them off her and use them to stab her.