One of the biggest problems students have with using websites in their academic work is the accuracy of the content. Here are some basic ways to evaluate a website.
What does the domain name tell you?
Who wrote the page? Is there a page author listed? If there is no author, is there a company name? Is there contact information listed? If there is no one listed that takes responsibility for the page you should take that into consideration.
Here are some links to reliable sites that will help you with your evaluation:
The following individuals, organizations, and universities maintain directories, portals, and gateways of interest to oceanographers: