Contact position by hydrophone
In my experience with GWX, It seems that when you are on time compression (or not), and the hydro guy finds a contact, it's always somewhere around 23.8 - 24 km away.
In bad whether it is more around 18 km.
Good to get that first observation point when you like making "fast 90's". Thought I'd let you know.
What's your experience?
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