I think I will try the 800hz on my bow unit. I like the 455hz. best so far on my console unit for finding stuff so far. I have not been to satisfied with the bow unit so far as I troll at much slower speed. Maybe the 800hz will give me better and clearer picture. I am running a 899ci HD SI. Question is what do most of you all use to get clear pictures on your bow sonars while slow trolling?