https://www.defense.gov/News/Releases/Release/Article/4017714/biden-administration-announces-additional-security-assistance-for-ukraine/
The capabilities in this announcement include:
• Munitions for National Advanced Surface-to-Air Missile Systems (NASAMS);
• HAWK air defense munitions;
• Stinger missiles;
• Counter-Unmanned Aerial Systems (c-UAS) munitions;
• Ammunition for High Mobility Artillery Rocket Systems (HIMARS);
• 155mm and 105mm artillery ammunition;
• Air-to-ground munitions;
• High-speed Anti-radiation missiles (HARMs);
• Unmanned Aerials Systems (UAS);
• Javelin and AT-4 anti-armor systems;
• Tube-launched, Optically guided, Wire-tracked (TOW) missiles;
• Small arms and ammunition and grenades;
• Demolitions equipment and munitions;
• Secure communications equipment;
• Commercial satellite imagery services;
• Medical equipment;
• Clothing and individual equipment;
• Spare parts, maintenance and sustainment support, ancillary equipment, services, training, and transportation.
The seeker on the missile can track targets up to 40° off the missile's centerline. A turret would have to be pretty large and it would add extra cost, complexity, and point of potential failure. It's easier to just turn the boat.