9 GHz Radar – is required on any vessel of 300 GT and over.
3 GHz 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.
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.