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These are the diagrams in the owners manual that I’m referencing. Again I’m not trying to slam this product by anymeans For all I know it is just great, and there like all products are a few bad ones that got away. Again I purchased it, (however I may have returned it) with the intent to keep it.
But I think if you call for help with picking up your jig, on the screen or anything else, they are going to tell you to use the Narrow for shallow, and the Wide for deep.
I think some of the confusion is due to the fact that in open water, deep water fishing (such as in the Great Lakes or in the Ocean) it is advised to use the lower frequency (wider) beam because lower frequency sound waves travel better/further in deeper water. Thus, when you are in REALLY deep water, you have to use the lower frequency beam (I’m talking about water around 300 feet or more). This is not a general consideration for most hard water angling.
So the image on Humminbird’s box is accurate for open water, deep sea fishing, but doesn’t fit the needs of hard water anglers at all. Use the wide beam to search out fish and define surrounding structure. Use the narrow beam for better clarity (less noise/clutter) and to focus in on a smaller area around your jig/lure.