i did alot of research and read alot of post on here about both HB and Low units! and after all the debate i decided to go with Lowrance, This is my first time owening a high tech unit i got the lowrance elite 7 combo its suppose to be made eiser to opperate then other models!? Altohug my dad has 2 HB units he also told me to go with the Low that the only reason he bought the other HB was so that he could link them together...(cheaper than buying 2 new units) Ive read the manual and didnt find it real informant but i did find some great videos on youtube!