Passives are *barely* able to home at 35 knots. Any faster, and they won't hear <insert noisiest band here> holding a concert at 50 yards...
That's my general rule of thumb anyway - though I only play with lwami now. There, they're registered with a max speed of 60, so while they should hear well at 55, the self noise at that speed (which the sensor is flagged to be affected by) is too much. I've had supertanker screws at some 50 yards or so without a 55kts passive reacting to it.
You can, through scripting, make sure to turn on the collision avoidance for any number of ships.
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