The App is called AASspeedometer
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Let the fish tell you how fast to run, If your going slow or almost sitting still, change the depth first and then speed up if that dosent help. What works today may not work the next 5 times you go out. As far as a HB and speed I have a 898, 998, and a ipilot link and they all run dead on all the time. If it says .03 on my ipilot it will say .03 on my 898 on the bow, it might every once and a while say .04 but never anymore difference than a tenth off .