From Baloogan Campaign Wiki
A category of sensor information in the Command model.
Periscope Search information indicates the presence and bearing of a periscope.
Sensor capability has evolved over time. More sophisticated engineering and processing of sensors has increased the type of information that can be obtained; older sensors are less capable.
Command distinguishes the sensor information types into:
Space Search - ABM Air Search Surface Search Mine & Obstacle Search Periscope Search Submarine Search Land Search - Fixed Facility Land Search - Mobile Unit Altitude Information Range Information Heading Information Speed Information