Random Subsector Generator

1001 SubSectors – Create Random Traveller SubSector Maps!

Select the race You want Your subsector generated for. The rules for subsectors are a bit different depending on which race You select. The planet names will be in a common language use by that race. If You select a frontier, outer limit or barren settlement type, then the planets are not part of the standard empire for that race. For Vargr, only small empires exists, so this is what will be created. If You select Pocket-Empires, You will (usually) get two interstellar powers in the same subsector (just as I recommend if You want to create a popular subsector.) If you select Zork, you will get a subsector with planet names that are inspired by an intrepid space explorer in a very small ship (that usually crashes.)



Atmosphere Fix:

Sector name:

Subsector name:

Capital name:

Random Neighbours:
Select if You want a random names for the neighbouring subsectors, or if You want to determine the names yourself.


Send to TravellerMap.com:

Planet Types:
Planet Key

Hydrographics is calculated differently using different Traveller rule versions.
Hydrographics = 2d-7+atmosphere
Hydrographics = 2d-7+world size.

Select Background:
Select dark or light background or select one of the other ones with stars and nebulas. You can also select a transparent background so that you can add your own backgrounds.

Download Image:
Right-Click and select save as!

Launch Editor:
The editor is a very simple tool that lets you edit the subsector. You should read about how the Subsector Editor works and its limitations before getting too frustrated.

Supplement PO2

14 thoughts on “Random Subsector Generator”

  1. Love the Settlement option. I am working a small spreadsheet project to do the same thing, do you have any guidelines for how the Barren through Capital levels specifically affect the UPPs? Thanks for any help.

  2. Is there an option to manually adjust some settings in the UPP? Or remove some caps (I was trying to create a Darrian Pocket-Empire but TL seems to be capped).

  3. What do the Barren, Outer Limit, Frontier, Backwater, Standard, Mature, Hub, and Capital Settlement options actually do? Is this from a published article somewhere or something of your own creation?

  4. The Settlement is my own creation. It changes the flat probability for a dice. No illegal values will be created.

    Frontier to Barren will also place the worlds outside the Imperium. (Except for Vargr and Pocket-Empire where only Barren is outside.)

  5. Can someone please link me to somewhere I can have the actual meanings of the Remarks? I mean. WTF is Lo???

  6. I see the base codes here seem to be from Classic, and Trade codes also. Not T5. Is that correct?

    I am guessing for Bases, N is Naval, S is Scout, 2 is both N&S, what is *, please? It appears on Solomani Sectors generated. Is it Solomani Naval & Scout?

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