blogger is good, google
sites is not a bad option for a more structured website, wordpress is great but has a cost to it - hosting and domain name. other platforms are as good, or superior but also cost more or require higher tech skills.
It all depends on the blog intention. if it is just documenting your voyage, blogger will be great, if you want more control over the platform, advertising, specific pages for different things, wordpress would be my choice.
In any event, get a good camera
I think that the visual content is what makes or breaks a good blog.
I use wordpress for my company blog
(no sailing) you can see the information arrangement and control I have, and it is just the tip of the iceberg with wordpress