gooseslayer I traded the transducer that came with my 899 and I believe the picture quality is quite a bit better than with the compact side transducer that came with the unit. I also purchased a da'ducer from rickie and put my hi def transducer on the front of the boat and saw a world of difference in the quality of the image. The da'ducer got the hi def down below my troll motor and it is about a foot under water so no problem with interference from anything on the boat. I just mentally add a foot to the depth showing on the depth reading. I don't think you will be disappointed in getting a hi def or getting the da'ducer from Rickie. Has anyone that has a 899, 999 had the 800 khz problem fixed by sending theirs in to humminbird for repair. Was just wondering.