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Message: <blockquote data-quote="Keystone" data-source="post: 352535" data-attributes="member: 11710">Neal, the owner of Southside Marine, replaced my HB 581. Had it on the water this morning. Works just fine now.  The F40 pushes my V167T at 30 mph with just me and my gear. I was able to hit 32 at WOT, but it runs best at @ 3/4 throttle and hit's 30. No sense wasting fuel for 2 mph.As for the 581. If you are looking for a lower priced Combo, keep looking. This one isn't one you will want. Very hard to see the screen most of the time. Look at the 600 series on Hummingbird and up.</blockquote>