Waypoints

[Pisces]

Your assumptions are correct. However, the torpedo tries not to penetrate the ceiling and floor setting. But who knows what weird loops it makes when it is in a dogfight with it's target. Atleast it shouldn't detonate outside those depths. So don't put the floor setting at the actual seabed depth, or ceiling right under the keel level of friendly contacts. Give it some margin of error.

You have no way to tell exactly how deep your target it. (maybe roughly with high frequency sonar, but that is too close anyway) Just if it is below or above the thermal layer if you can hear the sound only on one side of it. But iirc Dr Sid's test showed that the layer doesn't work anymore within some minimal range (about some 5 nm I think) So it doesn't really matter. It would just help delay the target noticing what it comming at him.