Tactical Diameter for "HMS Codrington", a large flotilla leader-type destroyer built in 1929, was very poor at 980 yards full speed.
For Tribal Class destroyers (built around 1937), this figure was better but still not good at slightly over 800 yards. Like "Codrington", Tribals were large destroyers more suitable for fleet actions than convoy escort.
600 yards at full speed was considered an average figure for destroyer-type ships of this era.
Unfortunately I have not been able to find figures for lower speeds.
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