Just an observation...
I networked 2 998's together and I am just blown away by the sharing of data between the two. I think this is one idea that HB got right! A great addition to my toy box.
GPS receivers, transducers, waypoints, AS360, I-Pilot Link and I am sure other things I haven't found yet are accessible from either unit. I can add waypoints on either unit and they immediately show up on the other unit. Navigation to the WP works seamlessly as well.
It lets me run a primary unit as SI full screen and the secondary as navigation only or add the high speed transducer.
Since the SI transducers are above the waterline at speed I installed the XNT-9-20 (Per HB Greg's recommendation) on the secondary. A quick on off of the dual beam XNT-9-20 at throttle up or down can be accomplished just using the power switch thereby eliminating the interference of the dual beam to the SI when I return to idle or trolling speed
If you have two units that can be networked I would highly recommend it .
Greg