Yes, you should search the
forums. I typed "SSB
weather portable" for the search keywords and found a bunch of discussions.
Here's what to look for:
propagation (time, frequency, and location),
interference (on your
boat, and the neighborhood), and
antenna (this is pretty easy for a receive-only radio). Get these figured out and you should be fine.
An external
antenna can help. I've been able to pick up distant weather stations using a built-in whip, but if you've got on-board
interference getting the antenna even a few feet removed from the
interference source can make a big deal.
There are many broadcast stations around the world that you can use for practice. It doesn't matter what they're transmitting, you can use them to get experience with the propagation issues. There are just some signals you *can't* receive. Learn about this stuff.