How do you determine that range? Also, what Tc settings are you using?
Personally, I stay on the move, and periodically dive to listen (2 hours in good weather, 1 hour in bad). So the contact can be anywhere when I hear him.
But learned from messing around with the mission editor that contacts become audible on hydro when they enter about 32-34 km range. So if you have set to a TC of 2048, and a contact doing 6 knots (low speed: 3.09m/s or 6.3km in 2048 'accelerated seconds') this could match your values if you reacted within a second or so.
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