Supplement Four
SOC-14 5K
Given my work with the post office, I have the view that the boundaries for subsectors are fairly hard, much like city boundaries.
I was thinking that, too, especially when I saw that long main that Paya is apart of. That thing run across several subsectors.
So, like the interstate connects towns, the city and state borders are hard, no matter the distance between city or town.
It makes it easy to set a sandbox just in a subsector, as Traveller often suggests and is done with The Traveller Adventure (though not quite a true sandbox).
I tend to treat subsectors like Regina similarly. The government has drawn a grid and told everyone, "This is the grid you're in." Locally, however, many sophonts are going to say "That's part of the Aramis cluster" or "I'm going to the Far Trace" even though the planet they're heading for is technically outside that particular border. This is also a way to help the players feel like outsiders when they refer to a place by the designation on the map, and a local says "Oh, y'all are headin' fer the Trace".
Yeah, I like that. And, I agree. This also means that Clusters can have sections to them. The Aramis Cluster has the Trace, the Far Trace, and the....you get the idea.