Overworld Travel

Take movement speed, divide it by a certain number to come up with hex-distance moveable each "turn"?

Come up with an amount of food or supplies the party consumes each "turn"?

Fill the map with areas the party can harvest for these resources, either once or repeatedly?

???

PROFIT?

Try... Traveller? Which I actually misread your title and how I got here. Massive world-generation rules in various editions, with city, continental, and world map creation aids and rules. There is a 'bootstrap' type supplement for TNE that talks about guiding fledgling colonies into profitable, surviving places, too.

File: slackbox.pdf (1B, 486x500px)

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>>44055825

This is a big trope in OSR games, so dig through the Trove in the OSR general and see how some different systems come at it.
Labyrinth Lord, Adventurer Conquerer King, Swords and Wizardry, and plenty of others have rules for this, ranging from fairly simple and straightforward to somewhat complex.
Have some resources, too.

File: hexcrawl-basic-cheat-sheet.pdf (1B, 486x500px)

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>>44059189

File: hexcrawl-advanced-cheat-sheet.pdf (1B, 486x500px)

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>>44059209

>>44055825
Ryuutama is almost entirely about travel, give that a looksee.

1 hex per day on foot.

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>>44059271

That's be okay for a ~20 mile hex of plains where it was easy to travel. 24 if there's a road. But difficult terrain will slow them down.

Six mile hexes have some advantages for for GM tracking, though, and you can get a max of four in a day.

File: crude6milehexstockholm.png (519KB, 805x629px) Image search: [Google]

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Also, a six mile hex is a MASSIVE amount of space. Here's one overlaid on Stockholm. You can realistically fit a large amount of stuff in one six-mile hex, but more likely you'll have one major thing and maybe one minor, hidden thing.
Using 24 mile hexes like that means you have a vast, howling wilderness with settlements so far apart that it only makes sense if the world just went through some apocalyptic event and there's been no time to rebuild.

>>44055825
I recall Gabe from Penny Arcade cooked up something interesting for his campaign, I think the details are online somewhere.

The wilderness travel rules from B/X.

You could borrow from Dwarf Fortress' fast travel.

Can't go through mountains with it

They have to be outside (could be modified to be surface level, so no fast travel from the inside of a dungeon)

Can't cross deep rivers unless there is a bridge. There are shallow ones that can be automatically crossed.

There are night creatures that move around, but that might be too difficult to implement; you could put encounters in certain hex tiles, maybe a few that move when the party moves.