02-03-2011, 03:10 AM
The single beam is 20 deg. You only really need the tighter beam if you are going to fish deep. I like to fish for lake trout in 100+ feet of water and if I'm using a 20 deg. beam that gives me a pretty big area. The 8 deg. makes it so that I can get a much more accurate picture at that depth. So if you are fishing normal depths, say 60 feet and under, I would not spend the extra money for the dual beam.
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