All of these answers have been really helpful and that explanation by rockin robbins made it clearer than it has ever been to me. I just want to know few more things. Do you need to send the bearing individually of range or is the bearing automatic? Also when using radar or hydrophone to send information to tdc, does it update the tdc dials or is it just inputing the info without any kind of acknowledgement? When I click send range from hydrophone to TDC, i can never tell that it has actually done it. Of course, if there is already an explanation as clear as the one in this thread about it, please point me in the right direction, the overall theory behind all the variables effects on targeting is interesting and helpful.
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