If that information is known, it can be used to generate predictions. Getting tidal information may not be easy. See David Flater's information on how to get hold of such data . If and when you get new tidal constituents that you'd like to see on this site, send them to David Flater - he maintains the database of tidal information. I get it from him.
Instructions are here .
You may make a link to our site without asking our permission. Of course, if I find that a link from your site is causing such a heavy load that our operation is being compromised, I may contact you about the problem. So far, this has seldom occurred. In some cases we have more than one dataset for a given location. They may be based on data collected at different times, from slightly different specific sites, or simply have come to us from two different data sources.