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@Snowolf :
logically thinking, steam boat best used at river, including wood fuel ...
for Sea and ocean, need coal or dense chemical fuel ...
try refined oil or good quality coal and good stove to resulting good energy ...
having weak fuel boat in Sea is same like suicide unless they prepare to SURVIVAL LIFE in boat ...
eat fish and do rowing, including a lot of sail, etc ... (not to mention not knowing where their aim should be)
make us think what Christopher Columbus has done is
REALLY ABSURD YET AMAZING ...
One Piece make it looks like it really easy, but it isn't ...