Oceansat-1 or IRS-P4 was the first Indian satellite built primarily for ocean applications.
It was a part of the Indian Remote Sensing Programme satellite series.
The satellite carried an Ocean Colour Monitor (OCM) and a Multi-frequency Scanning Microwave Radiometer (MSMR) for oceanographic studies.
Oceansat-1 thus vastly augment the IRS satellite system of Indian Space Research Organisation (ISRO) comprising four satellites, IRS-1B, IRS-1C, IRS-P3 and IRS-1D and extend remote sensing applications to several newer areas.
[4] Oceansat-1 was launched by the Indian Space Research Organisation's PSLV-C2 along with the DLR-Tubsat of Germany and Kitsat-3 of South Korea on 26 May 1999 from the Satish Dhawan Space Centre First Launch Pad of Satish Dhawan Space Centre in Sriharikota, India.