perception, experience and luck
Links:
[1] http://admin.indiaenvironmentportal.org.in/feature-article/gps-aid-fishing
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/down-earth
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/fishing-technology
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/fisherfolk
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/remote-sensing
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/kerala