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<blockquote data-quote="YATYAS" data-source="post: 85630" data-attributes="member: 1244">It is a nicer image but you are sacrificing a lot of coverage by using the 800 kHz beam vs. the 455 kHz beam.&nbsp; According to the HB manual, the 800 kHz beam gets you 130 degrees of coverage (the manual says the beam covers 55 degrees in each direction, not sure how they get 130 degrees total). In 20' of water that is about 40' of bottom coverage per side. This also limits the chances of finding suspended fish.&nbsp; Using the 455 kHz beam you have almost 180 degrees of coverage which extends what you see on the floor and suspended out there a ways further. I use 455 kHz almost always.&nbsp; I can easily find structure, weed beds, and bait fish which is what it is most useful for.&nbsp; After some practice and getting use to I can find fish (this is not always easy).&nbsp; Fish on a hard bottom are always harder to see so if I find rocks with what looks like fish mixed in, I will either fish it or investigate further by using the 2D sonar for confirmation.&nbsp; I will never switch to the 800 kHz and do another scan - just a waste of time.I once read somewhere that the HD on the 899 is not much of an advantage anyway due to the screen size.&nbsp; I would think this is true if you are running a split screen.&nbsp; Can't confirm that, I run the 1199.</blockquote>

[QUOTE="YATYAS, post: 85630, member: 1244"] It is a nicer image but you are sacrificing a lot of coverage by using the 800 kHz beam vs. the 455 kHz beam. According to the HB manual, the 800 kHz beam gets you 130 degrees of coverage (the manual says the beam covers 55 degrees in each direction, not sure how they get 130 degrees total). In 20' of water that is about 40' of bottom coverage per side. This also limits the chances of finding suspended fish. Using the 455 kHz beam you have almost 180 degrees of coverage which extends what you see on the floor and suspended out there a ways further. I use 455 kHz almost always. I can easily find structure, weed beds, and bait fish which is what it is most useful for. After some practice and getting use to I can find fish (this is not always easy). Fish on a hard bottom are always harder to see so if I find rocks with what looks like fish mixed in, I will either fish it or investigate further by using the 2D sonar for confirmation. I will never switch to the 800 kHz and do another scan - just a waste of time. I once read somewhere that the HD on the 899 is not much of an advantage anyway due to the screen size. I would think this is true if you are running a split screen. Can't confirm that, I run the 1199. [/QUOTE]

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