I don't think the enemy has any radar detection in the game, just radar. I don't think APR was implemented in stock, but I know Duci added it to US subs. This is different than an enemy radioing your position in. If you're spotted, different values exist between mods from how far radio will call in assets.
Mines do exist in the game, mostly near straits near Japan, outside harbors. Mods changed locations, amounts, etc...
|