adar and associated equipment required by Regulation 19 of SOLAS V comprise:
Radar unit – 9 GHz ("X" Band)
Radar unit – 3 GHz ("S" Band)
Electronic Plotting Aid (EPA) EPA equipment enables electronic plotting of at least 10 targets, but without automatic tracking.
NOTE – The wording of the Regulation in the case of EPA includes “..or other means to plot electronically the range and bearing of targets to determine collision risk.” Therefore manual plotting equipment is no longer acceptable except for existing vessels still complying with SOLAS V/74.
Automatic Tracking Aid (ATA)
ATA equipment enables manual acquisition and automatic tracking and display of at least 10 targets.
Automatic Radar Plotting Aid (ARPA)
ARPA equipment provides for manual or automatic acquisition of targets and the automatic tracking and display of all relevant target information for at least 20 targets for anti-collision decision making. It also enables trial manoeuvres to be executed. CARRIAGE REQUIREMENTS
9 GHz ("X" Band) Radar - is required on any vessel of 300 gt. and over. "X" Band radars can locate radar transponders including search and rescue transponders (SARTS).
3 GHz ("S" Band) Radar - to- be fitted as the second radar, which is required on ships of 3000 gt. and over unless the Administration considers it appropriate to carry a second 9 GHz Radar. The two radars must be functionally independent of each other. The MCA will require a reasoned case for why a 3 GHz radar cannot be carried. "S" Band radars will not detect SARTS or other radar transponders.
EPA - To be incorporated in Radar equipment on ships of 300 gt. and over, but less than 500 gt
ATA - To be incorporated in Radar equipment on ships of 500 gt. and over (replacing the requirement for an EPA) On ships of 3000 gt. and over the second radar must also be equipped with an ATA. The two ATAs must be functionally independent of each other.
ARPA - To be incorporated in one radar equipment on ships of 10000 gt. and over. The second unit must incorporate ATA if not ARPA.