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Even though the geometry of the game world is flat, the math (https://en.wikipedia.org/wiki/Horizon#Distance_to_the_horizon) can still be calculated and used to affect the detection range of line-of-sight sensors like cameras. A smaller value for planet radius will shrink the horizon, and can be tuned for game balance. For a ship that is partially below the horizon, the percentage of its bounding box that is both above the water and above the horizon could be calculated easily, and this can be fed into detection chances.
Aside from simulation fidelity, this has a few other advantages for gameplay, because more design, doctrine, and play-counterplay choices are available to the player:
1. A surface ship that fights at long range must either:
1.a. place sensors on a mast, which is difficult to armor without making the ship top-heavy, therefore making the components more vulnerable, or
1.b. offload targeting to a flying unit, which must be managed, opens up the chance of detection by wireless snoopers, and is probably a smaller unit and thus also more vulnerable.
2. A close-range brawler, on the other hand, does not need vulnerable masts or to offload its long-range targeting.
3. Small boats or helicopters can more successfully hide below the horizon.
4. Stealth ships are possible, as radar, not visual cameras, will have the longest surface-surface detection range. Radar detection can be mitigated with alloy or rubber blocks, but currently visual detection cannot be mitigated except by being very small. While both radar and cameras can be counter-detected, a stealth ship below the horizon will be able to counter-detect radar while being below the horizon from visual cameras.
A line-of-sight horizon limit would "nerf" all LOS sensors, but it puts cameras on the same playing field as the other sensors because they would all be capped to a similar horizon. Currently visual cameras are vastly superior to all other search sensors because the visual signature of vessels scales up very rapidly compared to thermal, radar, and sonar signatures.