1. Autosonar will classify contacts depending on how many possibilities there is. It takes him too much time anyway. But he tries to do so and sometimes he makes it.
2. You don't know. You must figure it by yourself. The easiest and quite reliable way is to watch torpedo bearing. If it does not change, it's on collision course. If it changes it's passing by.
3. Torpedo evasion is really complicated topic. It also depends a lot on the game settings you use (if torpedoes explode on CMs) and on mods you use.
4. You must classify manually. Most of the time I just assign friend or foe and class (surface, sub). When it looks like neutral I just mark it neutral and bother no more.
5. In simple words, depth is good. There can be thermal layer which divides the water to 'above the layer' and 'below the layer' .. you usually must change depth to scan both areas. Again, there is no simple rule.
Welcome aboard !
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