Hi Nick

You’ll have no trouble using this http://www.wxtide32.com/download.html

WxTide enables you to set custom locations, and also plot tide tables in advance.  It also integrates with the weather station software I use so that the tides are shown on the web site (this is the software we used for the wind at the NZ Open).

If you are doing 90 mile beach, we might get a possie together and join you!

Enjoy!

Grant2