Really? I was positive I had a B260 but edited my post after looking at airmars website. I changed my post due to the fact it said the B260 was 19 degrees @ 50khz (10' of bottom in 30' of water) and 6 degrees @ 200khz (3' of bottom in 30' of water). My screen says I'm covering 20+ feet so I edited my post to the B258 which is a bit wider cone. It's been 6 years or so since I installed it but remember it being a B260.

It seems to me that at that coverage, you would only see a fish if it is directly under the transducer.