/** Checks through the vector with fleets to see who's in time for the
* specified tick and staying long enough so they're not too early.
* \param fleets a vector with Fleet pointers to use for the calculations
/** Checks through the vector with fleets to see who's in time for the
* specified tick and staying long enough so they're not too early.
* \param fleets a vector with Fleet pointers to use for the calculations