I'm headed to Ontario for a fly-in in late May and plan to do some lake trout fishing along with walleye, pike, and bass. I've never taken electronics with me before, but I'm debating on taking an old Eagle b/w depth finder with me or if I should go ahead and take my Helix 7 SI. I have access to a good portable & adjustable transom mounting bracket for whichever one I bring. Any thoughts?