I WOULD NOT suggest manual downriggers on the coast fishing for silvers, you'll wear your self out. I'm not kidding in fast action when the ball is coming up and down a lot you don't want to be doing it manually. Fishing for lake trout where the action is slow, ya manual is fine.
Geez, another disagreement here, just bring #1 deck hand in the State of Washington - Robodad with you on your boat...

We manage fine, just got to give training to everyone on board on what they need to do in the Chinese fire drills that go off, well as much as possible... Hand cranking - makes for better stories than sitting there pushing a silly button that does the work.

Nothing like Down Rigger sweat to keep the game fun... And make the fishing better than ho humpty of reeling them in.... Especially when you get a triple or quad hook up. Glad - I man the net and thumper... Besides I take a lot of ex-mil and active duty guys with me, they have practice reeling vertically while previously on deployments!!!
