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Refueling.
Refueling and spares was one of the biggest challenges that the boat faced (other than air attacks) and OHII tries to add this. Resupply tankers are used in most objectives in the campaign, but a game limitation restricks you to one refuel only (I had always wanted to use two) per patrol (leaving and returning to dock).
EDIT: Resupply is now fixed by TDW - Use his patcher to fix this bug
I have the resupply issue enabled in TDW patcher. I used the radioman "request resupply" command in the Monsun Gruppe and resupply works.
I have tried using request resupply on other campaigns, other than Monsun Gruppe, and I was denied. I am not sure anymore if the request resupply was ever granted on any campaign, other than Monsun Gruppe, or some individual mission within a campaign. All years. I do not remember anymore.
Is something written into the open horizons campaign structure or each individual mission to trigger an approved resupply? If so, where for my own curiosity? Is the request resupply written on a historical basis only, similar to the type XIV milkcow U-boats and only available in the regions that happened in real history? Is resupply only hardcoded into the vanilla version, which TDW fixed, and has nothing to do with Open Horizons?
I can not determine what % values of low torpedoes or low fuel trigger a "request resupply" acceptance.