RSRD mission anti shipping HELP ME please

[mariokartjkl]

the mission tell me : "do anti shipping operation in singapore japanese lanes and stay for 72 hours " doesn't tell me the place,but the mission before conduced me near luzon strait so i think that there is the place

i stay here and move around for 1 fuuu month nothing only airplanes,the mission didn't end i don't know how complete ... help me please

it is my first time with RSRS i started a campaign at pearl harbour the 8 december 1941
first mission was : go here (i don't remember where) and patrol 150NM for 72 hours ok done
2 mission : go here to do anti shipping operation,i went near the place and the game gave me the 3 mission
3 mission : was that i have problems with. i can't finish thatttt help me please


sorry for my english anyway