60.000 yards is the maximum practical range to the horizon, but you have to remember that the submarines' radar and ESM reciever are mounted on small masts that protrude only a few feet above the surface of the water, thus drastically reducing the range at which detections can be made. If you surface the sub and raise the masts, you should be able to detect enemies out to max range, but submarines do not transit on the surface.
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