I am thinking that it is used in the Multi-Player missions, and has to do with player-controlled convoys... can't remember exactly KaleunMarco, but look in those missions under the "Game / Data / MultiMissions / ADV*.mis" files, and see if it isn't used in there. If memory serves (slow and inattentive service), it has to do with the range of Convoy Commanders influence on other ships and groups marked as "Tactical"... maybe.