July 3rd Update:
Compatible with ECR via comp submod
Small touch ups to Nevada & across the wasteland

@2icharlie I looked into your comment but unfortunately I could not replicate the results except for a few circumstances, but not quite as you described. The mod basically nukes the supply requirement for ships, although ports can be used to supply units and ship supply to closer ports. However, I could not find a way to make the ports themselves use as much supply as 25 without death stacking fleets and units.

I did make tweaks to the supply range of hubs, I found this to be a bit helpful for reducing the burden that ports take, but I admit this is hardly a solution to this bug. I tried with both UCM & plain OWB, but could not make any serious strides in making it as (somewhat) seamless as vanilla Hoi4. If this problem continues to occur, try reinstalling the mod (and OWB if it remains), otherwise please let me know and I can look more into it.

June 13th Update:
Cleaned up several areas of the map
Tweaked supply values to be more consistent among different nations & less attrition for the big wars
Added decisions for caravans & road construction
Now compatible with Fountain of Dreams

sorry, forgot to mention i use it with the utlimate tech compatability mod compatch, so i dont know if its that mod or this one that makes things weird

a cool mod, although seems to have a weird interaction with docks. the docks take up enormous amounts of supply (like 25, just about above the limit) even though theres no giant fleet there or seemingly any reason. but then if i build a supply depot in that same province the supply goes back down to single digits

Sorry for the late response, yes this mod is compatible with R&R. While not purposely balanced for R&R, I find that it is a good submod to have for late game scenarios or for more unique supply management

Does this work with OWB: Roads and Rail? While on the surface it looks like they'd work well together, I don't know if the code actually allows it.

sick

This looks incredibly promising! While I won't be using this mod right now since I'm using the various map expansion modmods, I will be subbing to this and keeping an eye on future updates.

At the moment, the only AI nation that is consistently struggling with the supply changes is the White Legs, I will get around to fixing this. Everything else is running smoothly with smaller nations and conflicts being able to play out normally. If you feel that there are bugs or unbalanced portions of the map, report them here to me.