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Old 02-29-2008, 04:33 PM   #2
Van
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Join Date: Apr 2002
Location: Quincy
Posts: 4,145
The dual frequency ducers are pretty common. Most units will switch automatically so you don't need to figure out, which to use, and when.

So either of those two will work nicely, there is not much difference that you will notice between those.

I have no idea what the dual beam is or how it works.
Also 45 degrees ??? I think that is a real stretch. We would all love to have that much beam---very uncommon.


Good Luck

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