Overland is one of the more important, but nearly invisible and hard to control mechanics in the game.
Supply Movement AlgorithmEdit
The supply movement algorithm is not complicated and knowing it will give a lot of insight into what is happening with supply draw, why certain bases have trouble getting supply et cetera.
Step 1. Every base is brought up to its supplies required. Bases will not send supplies to other bases if this would mean they themselves go below 3x their supplies required.
Step 2. Every base tries to get up to 3x its supplies required. Bases not send supplies to other bases if this would mean they themselves go below 3x their supplies required.
Step 3. Excess supply is sent to large bases, those with large ports, airfields and low spoilage limits
Step 4. LCUs get their supplies from bases. If a unit is in a base, only this base can supply them, if they are not in a base, every base within range will try to supply them
Whether a base can send supplies to another base or LCU depends on the distance between them, the sort of hexes and the day of the week. The distance is measured with trace level value (TLV), it starts at 100 and is decreased by the supply cost, given in the manual on page 189. If the TLV if 89 and above, supplies will flow daily, if 49 or above twice a week and if 10 or above once per week.
The supply cost will also mean supplies are lost during the movement, the supply cost being the percentage lost, however this is capped to 20%.