The scan rating of a ship, installation, system or piece of equipment indicates how far it can see. A scan rating of x gives a visible range of (1+s)/2. (Distances are computed as in regular Euclidian geometry, as sqrt(x²+y²).)
Using `+' to indicate visible sectors and a digit to indicate the location of the scanning object, the visible range for objects with scan ratings 0 to 6 is as follows:
+ +++
+ +++ +++++ +++++
+ +++ +++ +++++ +++++ +++++++
0 +1+ +2+ ++3++ ++4++ +++5+++ +++6+++
+ +++ +++ +++++ +++++ +++++++
+ +++ +++++ +++++
+ +++