Kip336 said:
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Sonar checks or Hydrophone checks? Both are quite different.
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Posters here normally use the term "sonar" as shorthand for "passive sonar", as I think you're well aware. My first paragraph would have made that clear anyway - I said that sonar gave 30km+ "seeing distance". That would hardly apply to active sonar, would it? Your reply implies you don't use passive sonar at all, or rarely.
The fact that you get map contacts doesn't mean there are no other targets near your boat, either when you first see the map contact, or en route to intercept the contact. You're missing out, big time.