Baltimore, small boats are harder to hit than missiles. Missiles mostly follow a trajectory according to laws of physics. and you also have million $ budget to hit them. The boat can maneuver and is subject to waves and wind and you are using simpler munitions to hit a boat. Also, in this case, US Navy is covering large areas so sensors and munitions might be at far distance. So, even if everything is done right, the boat movement while munition is flying is affecting results. Look at Iraq/Afghanistan time videos of shooting moving vehicles – a somewhat simpler problem as the aircraft is closer and the car is moving on the road.
