I play GWX. I have been keeping an eye on the range of the contacts when my SO reports one. The maximum he has reported is 29.7kms.(measured with the range tool) This is using the upgrade listening device. The name escapes me at the moment. (The one on the upper deck).
With the previous listening device, the maximum was around 9-10 kms.
As the SO goes up in experience he seems to be getting better; so much so that i prefer to travel submerged due to the increased range of detection.
