SD radar is, if installed, always on. It will only detect and warn for air targets, not surface contacts. Tested and confirmed.
The SJ radar set however, can be turned on and off, and does have a panel, unlike the SD radar. The SJ radar shows the PPI screen and the round one (can't remember the name) and can be set to three different ranges and focus or sweep operation.
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"Shoot at everything that moves. If it doesn't move, shoot it anyway, it might move later."
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