I’m wondering if I can find a laptop that can be used outdoor even if raining, or I can bring it while sailing pumpboat and seawater will soak it without damaging the system.

For sure, there will be a laptop that will not be damaged when spilled by water. It will be released by the Matsushita Electric which is famous for its Panasonic Computer:

You’ll be able to spill water on a new laptop from Matsushita Electric without having to fret about ruining your computer. (LINK)

However, this laptop will be capable to avoid damage with the small amount spilled liquid only because it is designed for light water spill only:

The new Let’s Note CF-Y5 features a waterproof sheet and special drainage system that protects the hard drive and circuit board from light water damage, Matsushita said in a statement. (LINK)

Anyway, it’s already fine.

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