These comments about fast ferries and their handling are very interesting, mostly because there are not so many people acquainted with them, and because of their quality.Probably due to my poor understanding of English, and surely of the "waterjet controls vocabulary", I would like to know what you mean by "jets opened" (buckets up?), and how you achieve parallel movements (sideways?), with the help of bowthrusters?
Some elaboration about the controls would be very welcome. Do you still have lateral thrust when jets are closed?
I will try to explain it as best I can without drawing a diagram.
First thing you have to understand is the waterjet nozzles both rotate. 30 degrees right and 30 degrees left.
No bow thruster, or thrusters.
Now picture the port nozzle facing this direction / ---- \ and this is your starboard nozzle. Jets opening outward.
In SS 2008 that would be port nozzle 30 degrees, starboard nozzle -30 degrees.
This is called walking a vessel sideways.
Drop the bucket (thrust redirect for reverse) on the port engine and back down with a little more power then your starboard.
This is for two reasons- The bucket redirect is not as efficient as the jet pushing forward and the thrust has much further to travel past obstructions under the hull.
Again, picturing those nozzles in the / ---- \ configuration. Port nozzle is pulling back, starboard nozzle is pushing forward...what happens?
The vessel moves this way <----------------------------
Reverse throttles to go the other direction. This is A LOT EASIER than a vessel walking with twin screws, with or without a thruster.
Nozzles in the closed or V position look like this \ ---- /
For slow speed maneuvering, a speed brake is applied to block the full thrust from the jet nozzles. By alternating which bucket you open and close you can turn the vessel quickly. Port thrust pushes the bow to starboard, starboard thrust pushes the bow to port. Since the waterjet vessel has no rudder(s), bare steerageway does not apply.
Hope this explains things a little better.