GPS, singlebeam sonar, and temperature would be fine at those higher speeds. From what I have experienced, side scan starts to degrade in resolution after 3kts. You can’t really use T200s for this, they have the torque to move largeish USVs, but not the speed. I’d recommend a high speed direct drive brushless motor with a high speed propeller or a jet drive. Luckily there are a few 3D printable jet drives on Thingiverse and even a small hydroplane boat.