An open water coiled tubing control system, comprising: a. a reel configured to accept a coiled tubing string; b. a surface injector in fluid communication with the coiled tubing string; c. a reel tensioner configured to control an arch formed by the coiled tubing string between the reel and the surface injector; d. a subsea assist jack configured to move the coiled tubing string into or out of a subsea well; e. a predetermined set of sensors comprising: i. a surface injector load sensor configured to detect and provide data related to a load at the surface injector; ii. a coiled tubing string movement sensor configured to detect and provide data related to movement of the coiled tubing string in the reel tensioner, the data comprising speed of movement; iii. a surface injector movement sensor configured to detect and provide data related to movement of the surface injector; iv. a vessel movement sensor configured to detect and provide data related to movement of a vessel, the data comprising active heave data or passive heave data; v. a subsea assist jack load sensor configured to detect and provide data related to a load at the subsea assist jack; and vi. a subsea assist jack movement sensor configured to detect and provide data related to movement of the subsea assist jack; and f. a controller operatively in communication with the predetermined set of sensors, the controller configured to use information it receives from the predetermined set of sensors to maintain the coiled tubing string at a predetermined tension by determining a continuous movement rate of the surface injector versus an interrupted rate of the subsea assist jack. a. a reel configured to accept a coiled tubing string; b. a surface injector in fluid communication with the coiled tubing string; c. a reel tensioner configured to control an arch formed by the coiled tubing string between the reel and the surface injector; d. a subsea assist jack configured to move the coiled tubing string into or out of a subsea well; e. a predetermined set of sensors comprising: i. a surface injector load sensor configured to detect and provide data related to a load at the surface injector; ii. a coiled tubing string movement sensor configured to detect and provide data related to movement of the coiled tubing string in the reel tensioner, the data comprising speed of movement; iii. a surface injector movement sensor configured to detect and provide data related to movement of the surface injector; iv. a vessel movement sensor configured to detect and provide data related to movement of a vessel, the data comprising active heave data or passive heave data; v. a subsea assist jack load sensor configured to detect and provide data related to a load at the subsea assist jack; and vi. a subsea assist jack movement sensor configured to detect and provide data related to movement of the subsea assist jack; and i. a surface injector load sensor configured to detect and provide data related to a load at the surface injector; ii. a coiled tubing string movement sensor configured to detect and provide data related to movement of the coiled tubing string in the reel tensioner, the data comprising speed of movement; iii. a surface injector movement sensor configured to detect and provide data related to movement of the surface injector; iv. a vessel movement sensor configured to detect and provide data related to movement of a vessel, the data comprising active heave data or passive heave data; v. a subsea assist jack load sensor configured to detect and provide data related to a load at the subsea assist jack; and vi. a subsea assist jack movement sensor configured to detect and provide data related to movement of the subsea assist jack; and f. a controller operatively in communication with the predetermined set of sensors, the controller configured to use information it receives from the predetermined set of sensors to maintain the coiled tubing string at a predetermined tension by determining a continuous movement rate of the surface injector versus an interrupted rate of the subsea assist jack.