Newbie: How much do you "tip-toe"

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There's a rule called the 5/50/5 rule, where you alter your course by at least 50 degrees, and speed by at least 5 knots, at least every 5 minutes. It's more a defensive tactic designed to stifle the other guy's TMA, rather than help with yours, though. Good for surface ships and possibly the best passive defense to employ, as the sub is relying pretty much altogether on TMA.