My Tuna fishing vessel have you used past experience and Chlorophyll  information the last 5 years. It has help to pin point where the big giants of the Indian Ocean are feeding.

Ocean color show the density of the Chlorophyll in the ocean. As you can see the south coast of Java in the picture on the left have high density of Chlorophyll. It also have information on the ocean Temperature and cloud formation.

I hope this will help you next fishing trip. Goodluck!