JRC JMA-5312-6 Instruction Manual page 330

[Example of Display]
Attention
When the SART function is set to ON, small targets around own
ship will disappear from the radar display. So it is necessary to
exercise full surveillance over the conditions around own ship
by visual watch in order to avoid any collision or stranding.
If two or more sets of radar equipment are installed on own ship,
use one set of 9 GHz band radar for detection of the SART signal
and operate others as normal radars for avoiding collision,
monitoring targets around own ship, and checking on own
ship's position and avoidance of stranding.
After end of detecting the START signal, turn the START display
off. Then the radar returns normally to the nautical mode.
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