Avionic systems refer to the general category of aviation electronics including radar, IFF, ILS and radios as well as the navigation aids such as INS, TACAN and VOR.
Sonar (Sound Navigation and Ranging, my particular job) is used primarily for contact detection and avoidance, and virtually always used in Passive Mode (listening). The only exception is when the...
A Unitary form of government is one in which sovereignty is wholly in the hands of the national government, so that the states and localities are dependent on its will.
A Confederal form of...