Sorry I have not posted for a while but just got my HB 898 SI mounted around 6/15 and had about (3)
trips trying to adjust the SI. The 898 worked good with good pictures ( no snap shots at this time) at trolling speeds but as I got on plane the dept finder looked like it had air bubbles so I adjusted the transducer down to the bottum of the bracket. After the silicone had time to dry I tried the HB again the HB still had good pictures at slow speeds but when on plane the HB lost the bottom. I now have adjusted the transducer back to what the instruction said !/8 to 1/4" from the bottom and waiting on the silicone to dry again. I wanted to know if anyone has had this trouble with air bubbles and losing of bottom. I will try the HB maybe tomorrow but wanted to know if anyone has had this trouble. If I still have the trouble with no bottom I will call HB Tech.
Thanks for any help.