bids are invited for bay of bengal northern portion chart 31 , kochi to vishakhapatnam chart 31 , bay of bengal southern portion chart 32 , kanyakumari to colombo chart 263 , sagar island to dharma port chart 302 , dharma port to paradip port chart 302 , approaches to chandrabhaga chart 304 , approaches to gopalpur chart 305 , palk strait chart 315 , palk bay western portion chart 317 , kalingapatnam to gopalpur chart 353 , sacramento shoal to kalingapatnam , ramayapatnam to sacramento shoal , approaches to palk bay chart 358 , valinokkam anchorge chart 2037 , tuticorin harbour approaches to tuticorin chart 2075 , approaches to kakinada chart 3042 , krishnapatnam port chart 3034 total quantity : 18