Security ratings:

-1.9 and above: you can enter all space freely

-2.4 and above: you can enter all but 1.0

-2.9 and above: you can enter all but 0.9 and above

-3.4 and above: you can enter all but 0.8 and above

-3.9 and above: you can enter all but 0.7 and above

-4.4 and above: you can enter all but 0.6 and above

-4.5 and below: you cannot enter secure space without being fired upon by the navy/concord