Yes, I was assuming that, because that's all you described: sailing across water.
The point I'm making is that if it was a deliberate choice to choose sailing over another option then, yes, the players should be weighing the risks/rewards of both (many?) options.
But if it's just something they need to do in order to continue the adventure, then they aren't really making a choice, even if they "elect" to do it. Any more than I'm choosing which card to play next in the card game War.
Forcing a dice roll with potential consequences in that case is not really "playing a game", it's just imposing simulationism.