Furuno NAVNET GD-1920C - Manual (Page 65)

2. RADAR OPERATION
2-36
General procedure for detecting SART response
1. Use the range scale of 6 or 12 nm as the spacing between the SART responses is
about 0.6 nm (1125 m) to distinguish the SART.
2. Turn off the automatic clutter suppression (if applicable).
3. Turn off the Interference Rejector.
2.27.3 Racon (Radar Beacon)
A racon is a radar transponder which emits a characteristic signal when triggered by a
ship’s radar (usually only the 3 centimeter band). The signal may be emitted on the same
frequency as that of the triggering radar, in which case it is superimposed on the ship's
radar display automatically.
The racon signal appears on the PPI as a radial line originating at a point just beyond the
position of the radar beacon or as a Morse code signal (see figure below) displayed radially
from just beyond the beacon.
Racon
Appearance of racon signal on the radar display