Quote:
Originally Posted by ArmySGT.
Which I assumed right away........ I don't think it is until the 1970's (my example) that integrated a computer to run filters and make full use of a hydrophones sensitivity. The 40's and 50's are vaccuum tube systems with transistors only making units smaller, but not more efficient to the best of my limited knowledge.
Are the displays on these commercial systems even large enough to do Anti submarine or counter sabotage (anti-diver) operations without a penalty for the operator? Do they have variable modes and systems to screen out some or most noise?
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The other issue with commercial/recreational depth finders is that they are always "active" (pinging to recover the info you need). A sub WILL know you are there because it can track YOUR depth finder's signal. And it will know it AT A MUCH GREATER DISTANCE THAN YOU CAN "SEE" THE SUB. This is one very big issue with any ACTIVE ELECTRONIC DETECTION (radar,sonar, radio sweepers, etc...).