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Originally Posted by Bera
I´ve always wondered if, in real life, ships and subs always use the same frequency on their active sonar. Well, it surely gives away your position... But do you need to tell the enemy WHO you are as well as WHERE you are?
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I think different freqs have different performance characteristics. I'd speculate that different sonar designs have different optimal frequencies for the best results. It's also probably safe to say that lower frequencies yield longer ranges, while higher frequencies provide better resolution, so there are choices to be made in how you want your sonar to perform in chosing a frequency (or perhaps, frequency range).