One must learn to balance trust with paranoia. Not everyone is out to get you but normally they are.

Burrow / Drone Collection (easiest)
Hideaway / Drone Cluster
Refuge / Drone Assembly
Den / Drone Gathering
Yard / Drone Surveillance
Rally Point / Drone Menagerie
Port / Drone Herd
Hub / Drone Squad
Haven / Drone Patrol
Sanctum / Drone Horde (hardest)

Sensor Types:
Magnometric – Gallente - Ion
Ladar – Minmatar - Phase
Radar – Amarr - White Noise
Gravimetric – Caldari - Spatial

Security Status:
-0,00 to -1,99 orange overview
-2,00 to -2,49 no 1,0 systems
-2,50 to -2,99 no 0,9 systems
-3,00 to -3,49 no 0,8 systems
-3,50 to -3,99 no 0,7 systems
-4,00 to -4,49 no 0,6 systems
-4,50 to -4,99 no 0,5 systems
-5,00 to ....

Scanning info
1 au = 149.000.000 km
3 au = 447.000.000 km
7 au = 1.043.000.000 km
48 au = 7.152.000.000 km
Max Scanner Range = 14.413 AU