diff --git a/DATA/UNIVERSE/sectors.ini b/DATA/UNIVERSE/sectors.ini
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+; REM nav map: the sectors of the galaxy view (REM-Client docs/rem/navmap-rework-plan.md, rem/navmap_sectors.h).
+; A sector is a region of worldmap.ini; it shows once the player has been to one of its systems.
+; universe.ini [system] navmap_shape = square | round overrides a sector's system_shape.
+
+[Map]
+spacing = 5000                  ; the world map's spacing for the map (a server with a world map sends its own placements)
+
+[Galaxy]
+sun_from_center_ly = 26000      ; Sol to the galactic centre, in the Orion Arm
+
+[Sector]
+nickname = sirius
+region = sirius
+name = Sirius Sector
+star = A1V+DA2                  ; Sirius A and its white dwarf Sirius B
+galactic_lbd = 227.23, -8.89, 8.6
+system_shape = square
+
+[Sector]
+nickname = sol
+region = sol
+name = Sol Sector
+star = G2V
+galactic = 0, 0, 0
+system_shape = round