Remember that the jetboat has no rudder - its forward / backward motion
& steering is all provided by a water jet. So your boat can only turn if
the jet is on (the accelerator button is pressed).
In order to make a sharp turn you must slow down on the approach by
releasing the accelerator; then just before the start of the bend,
hold the 'accelerate' button & steer into the bend.
Taking a wide line around the bend to keep the boat's speed as high as
possible is more important than taking the shortest line through the bend.
You can use the 'brake' button to get around tight bends - steer into
the bend while accelerating, and then tap the 'brake' button & reverse the direction of steering
to increase the angle of your turn - although with some loss of speed.
Use the turbo boost option by pushing the Space bar. This will give you a temporary boost of speed,
so you can use it to catch up with your opponents, or extend your lead. Each time you use it, the turbo gauge will reduce by three points.
The turbo gauge will increase by three points each time you pass a gate.
Using the boost while turning into a corner will make the boat turn faster