It seems correct.
But sometime I hear it before the crew, about 25 km maybe little more.
It's simple: when I'm in x2048 if the clock stop a short moment it means something big is near me.
Sometime it's just a dolphin but often it's a ship.
That's just because I have not enough memory, only 1Gb.
With 4 Gb I'm sure the clock never stop.
