Turns out that in the stock game DDs have radar. It's air search radar but it shares the same bug as the SD and detects ships and periscopes.
I'm still intrigued with this. Perhaps the mod could be a new active sonar that only goes to a depth of 100ft or so, with very very short range.
A similar technique could be used to mod ijn MAD gear. Active sonar, but with no ping sound. Have the distance it detects from the plane set to 100m or something, low enough flying planes could get you submerged.
tater
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