1. It is very hard to detect kilos on passive sonar unless they are moving quickly (say, 10 knots plus for Improved, 6 knots plus for standard). They are as detectable as anything else on active sonar though, and depending on aspect and sonar conditions you can expect contact from 3-10nmi or so.
2. Clear datum so that you're not in the acquisition cone when it enables. If fired from longer ranges (more than 5nmi) by all means, just drag (run away). The nixie is help if one acquires, but don't count on it too much because it can only stop one (I think you can reel it in an re-deploy and it'll work again, but that takes time).
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