Not sure if this has been pointed out but there's been dozens, if not hundreds of deaths to simply not knowing rowboats can't go into deep sea.
I think it would be worth it for the newer players, but even still, would be kinda grumpy if it's there 24/7. Maybe it's possible for the bar to only pop up once you take a tick, or drive it into the deep sea.
As mentioned above, it'd be good for whirlpools, because while I've never drowned to the deep sea, I've definitely drowned to whirlpools :3