This distinctive and unique radar signal is easily recognized and is therefore much easier to spot than a single echo such as from a radar reflector. Moreover, the fact that the SART is actually a transmitter means that the return pulses can be as strong as echoes received from much larger objects. The SART also provides a visual or audible indication of its correct operation and will also inform survivors when it is interrogated by a radar. A SART built to the latest specifications will have excellent receiver sensitivity, and will detect the high power pulses from a search radar at a much greater range than its relatively weak return pulses will be detected by the radar. The limiting range is therefore determined by the return path.
Bigger ships tend to have higher gain antennas, set higher above sea level.
The radar receiver performance is also very important. Elimination of sea and rain clutter will depend on the radar used, and the skill of the operator, as for normal radar operations. The mounting of the SART is the one factor over which the SART user has some control. For maximum range an unobstructed mounting as high as possible is required. This assumes a search radar complying with IMO requirements, with its antenna 15m above sea level.