ManosEnvironmentPro sets the visual horizon at 20 km. That's 10.8 nm or 12 statute miles. This is closest to the RL figure that Golden Rivet mentions. Other environment mods may do the same. The maximum visual range only applies, as in RL, when the weather is perfectly clear.
BTW, MEP v5.0 has an optional mod the simulate Earth curvature. Near max visual range, only the superstructure of the target ship is rendered. The hull remains "below the horizon." Nice touch!
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