Take a look at this concept:
1.- A sub would be in danger of being spotted in any case in the red area, depending on light, profile and such. Can be used to fine tune the current visual sensor.
2.- In the orange area, the sub would be in danger of being spotted if fully surfaced or with scope extended. Decks awash should reduce the danger greatly, and peri depth exclude it.
3.- In the yellow area, the sub would only riske being spotted if running in the surface with a high periscope.
How does that all sound? Seems possible? I have no idea if giving the sensor a minimal heigth is possible, but the concept could be worth testing :hmm: