I have decided to upgrade my trolling motor and depth finder . I am looking at the terrova 80 ipilot and ilink with a 60 inch shaft for my lund 1775 , is the extra 300 for ilink worth it ? Also looking at the humminbird 998 side imaging down imaging depth finder . I currently have the 798 hd si di , can I hook the 998 up to the 798 ? Still learning need to know before spending a fortune on electronics . What is y'all's opinions on what I should buy for fishing green and spider rigging alot ? Do I need the ilink ? Thanks in advance ! Jason