If I'm patrolling then I'm using the most efficient speed for a Type-7 boat: 8 knots. If I am trying to get ahead of a single target or convoy then I go at full or flankspeed. (depends if I need that extra knot) Once I have arrived wel in front of them I lie await coasting, deadstop or very low speed. As soon as the targets are shot at I dive deep with haste (only with escorts around), not worrying so much about noise until I am at a safe depth.
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