Hearted Youtube comments on Anders Puck Nielsen (@anderspuck) channel.

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  48. Few other issues which makes sea drones hard to target. 1. The curvature of the Earth. If your radar is 5m off the water, at 10km, 0.3m (over a foot) is obscured. If the drone is 1m high and you have 0.5m waves (pretty calm), the most you can see is 20cm of the craft. 2. Speed. A typical speed boat running 45 knots is closing at about 1 km ever 40 seconds. Even if you can "see" it at 2.5km, you could have less than two minutes for someone to scan a five or six square kms of ocean. 3. Vision. Darkness, fog, rain, sun in your eyes, etc. can all make it all but impossible to see those distances. Further, if you are in harbour and anchored you probably have coastline, rocks, islands, other ships, etc. 4. Other attacks/distractions. Air attacks, air drones nearby, etc. can easily get your attention. Naval drones can use smoke screens, flares, lights, radar reflecting panels, chaff dispensers, etc. to draw attention. A drone 5km out with a blinking light and aluminum panels is going to draw attention. 5. They are almost impossible to target. They are too small and moving too fast for missiles or large gun systems to target with any radar-based system. Something like a 50mm gun would need a thermal or night vision site and they are hard pressed to hit things the size of people moving quickly with single shot weapons and they pretty much need direct hits. A raid firing 30mm system might, but most of these are radar guided for use against aircraft. When aimed at something 3km away on the horizon, they can't easily spray and area. Most visually aimed heavy and machine guns typically don't have thermal sights, can't easily be aligned to radar or thermal directions (i.e. the gunner needs to visually see the target even if the ship's radar or thermals could see it), and realistic ranges are likely in the sub 1km range. (i.e. you have less than 45 seconds). etc. This said, there are things other navies can do which help -- staying out at sea, moving, using thermal imaging systems, smoke screens, patrol boats further out, nets and sea fencing around ports, or specific ships, proximity detonating mines/buoys around ships, laser grid detection, radar on smaller patrol ships, acoustic sensors, GPS/data sharing (so you know where your own ships are), etc.
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