RFB 2.0 has this setting way off.
Here's TMO 2.0's air plane visual setting for depth capabilities:
TMO 2.1 and 2.2 decided to return to the stock game parameter of zero:
Here's RFB 2.0 setting for air plane visuals:
If you haven't figured it out yet, the greater the figure below zero (in the minus range) the better the planes will spot you. Just how far into the depths -75.0 takes it, I don't know. As you pointed out 190 feet isn't enough.