He added that the satellite is also equipped with the cutting edge Geostationary Ocean Color Imager-2 (GOCI-2), which can check for algal blooms and other water contaminants. GOCI-2 is able to cover an area around 2,500 kilometers in diameter 10 times a day. The optical resolution used on the Chollian-2B is four times sharper than previous sensors used by South Korea, making it that much easier to detect red and green tides and improving the possibility of giving advance warnings to regions that may be impacted.