Living on the Med we don’t have to worry about tides, but having grown up just off the Bay of Fundy, they are always on our minds. In fact, we found it quite funny that the RYA distinguishes some courses between tidal and non-tidal.
In any case, we happened upon this site called tides.info. It is a bit awkward looking, but uses a Google Maps interface and forecast tides anywhere in the world. We can’t speak for it’s accuracy, but it looks easy and convenient.