[tbontob]

Arcon says:

Just remember, at level 1 the scanner range is only 1 square. At level 2, 3 squares. If you want to spy on a certain ship, you may have trouble getting close to it -- esp. on simultaneous. The level 3 scanner reaches 5 squares. So I don't know if having it in one square of the solar system would let you scan the diagonal opposite square. You won't often miss a ship on level 3, but it could happen if someone was trying real hard.

Something else I didn't know!