Quote Originally Posted by Hanr3 View Post
Which would be better on the bow, the 899 HD SI or 858 SI?
The units will share all sonar screens, including giving you the ability to view the SI from your 899 on your 858. They will share everything except map cards (such as Lakemaster). They will even share transducers if you want. I run my 899 and 859 from a single shared transducer.