Are you for real?? Why not pick the end of the ship at number 4 spot while you are at it?
You can take off using that spot (in fact you can take off using any spot on a ship, but that is NOT the shortest spot for take off) You count the length of a ski jump from the beginning of the platform til the end of that platform, not the entire run off area, because run off area is different between different spot, you can literally take off from next to the island or at the end of the ship.
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Those line is for aircraft to be on station to hide from the blast to basically queue up, you don't launch aircraft from the end of the dotted line. (You can but not a must) CVN-70 have those at the rear of those ships too, that does not mean the run off is from the red circle to the edge of the ship
This is an actual video of Mig-29K takes off from INS Vikramaditya
Notice that the aircraft launch from next to number 2 spot next to the island (the circle with a 2 on it ) This is corresponded to the red square on this picture of INS Vikramaditya
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Which is roughly 1/4 to 1/3 of the entire length of the deck, seeing INS Vikramaditya only 900 ft long, the runoff cannot be more than 300 ft in length. While the cat on Nimitz is 326 ft long Your mark is 150-200 ft off.