If this is the case, he should issue contact orders for those units to be informed of his presence. The contact order may also be specify a player number. In this case, every unit in the specified player's faction will be aware of the hidden unit's presence. Contact information is maintained until the hidden unit moves. Once the unit has moved, it must issue new contact orders if other units are to continue to be able to interact with it.
Units belonging to the same player are always aware of each other's presence.
They do not need to use contact . Hidden units are not shown in the location report, even if their presence has been reveal through contact or seek .