gamma ray sensor 445 a directional sensor 450 a pressure temperature sub 460 a casing collar locator 470 and or a voltage converter sub 475 the bha 400 may further include various disconnects such as an electrical disconnect 480 and a ball drop disconnect 485 accordingly fig3 depicts one representative grouping of components that may comprise the bha 400 however one of ordinary skill in the art will readily appreciate that the bha 400 may be configured to include a variety of different components and may include additional or fewer components than those depicted in fig3 depending on the well plan referring again to fig2 if no water currents 230 were acting on the drill string 135 and if the floating vessel 110 was stationary then the drill string 135 would extend vertically downwardly from the floating vessel 110 in a straight line into the bellmouth 185 however the water currents 230 impose lateral forces on the lightweight drill string 135 thereby causing the drill string 135 to be deflected horizontally in the direction of the water currents 230 as the drill string 135 extends from the floating vessel 110 towards the bellmouth 185 therefore the bha 400 is preferably physically guided such as by remotely operated vehicles rovs through the water 140 to enter the bellmouth 185 thereby allowing for the floating vessel 110 to be positioned directly over the wellsite 160 remote cameras may also be provided to help direct the bha 400 into the bellmouth 185 due to the water currents 230 if the bha 400 is.