I.E a radio controlled boat you can attach your main line to, then take it out for a spin, range of up to 350 feet apparently.
When a fish tugs on your line, it detaches from the boat and you can reel it in as normal.
I'd say it would be great craic but I don't know how effective it would be.
Standing on Howth pier on a sunny day with a few beers, driving a little boat around sounds like a nice way to spend a few hours though!