$H_{gc{\omega }_v}$

Takes the value 1 if tugboat g is at cell c and is not able to hook-up with vessel v under scenario ${\omega }_v$ , within a predefined threshold $\rho$ , and 0 otherwise.

Additional Variables

$y_{{\omega }_v}$

binary variable taking the value 1 if no tugboat is able to rescue vessel v in scenario ${\omega }_v$ , 0 otherwise.