The S.S. Winno is one of the two ferries that you can ride across Spira. This one ferries people between Kilika Island and Luca.
You can obtain the “Jecht Shot” while onboard the S.S. Winno. Check out the walkthrough section for more information, but you can return to this area at any time to re-attempt the Jecht Shot mini-game following the same instructions listed in the walkthrough: