Typically when dealing with cone angles a narrow cone is better for detail in depths and a wide cone is better for coverage up shallow where detail isn't as big of a concern. Example would be trying to see whats on a deep foundation or say one of Old Hickory's submerged locks. A narrow beam will give you far better detail than a wide beam going over that structure. Your window of coverage may be smaller but its a trade off. Then on the other hand up somewhere shallow looking for stake beds a wide beam will help you find them faster than a more concentrated narrow beam.
Usually an auto setting will take care of this but sometimes you need to change it yourself.
Last edited by Travis C.; 08-09-2013 at 12:19 PM.
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