The FUGU seat suspension have a vertical travel of 150mm.
Every suspension should move precisely opposite way of the force it tries to eliminate. In a boat, this means slightly forward and down. This is the most efficient way to mitigate the G-forces and will also increase the comfort for the boaters.
If the body moves forward and down and the seat move in any other direction you risk loosing grip and support from the seat. With the FUGU suspension this will never happen.