I want my side scan at the console, but I want to be able to transfer GPS waypoints to another unit at the bow attached to the trolling motor.

I am thinking 898 at the console, but wanted an inexpensive unit up front. Good point about wanting a bigger one after putting a cheaper unit in - does the 700 or 800 series (not side scan) have more memory as far as waypoints? Faster processor?

Thanks for all the replies.