Dave, or "Phineas" or "Tolstoy" or,
Transmission Interference (Opposed sensor test modified by movement points to reach target to discard an opponent's mission). Can you not scan through unexplored hexes or if so, how many movement points are they worth in these scans? You cannot use Transmission Interference through unexplored hexes. Here is an official answer.
A friendly tip: try to ask any expansion-specific questions in the Rules forum for the expansion. Although you can use any new rules from the expansions even playing just with the base set, anyone with only the base set and no expansions won't know the rule you are asking about.