I've had tide watches previously and they have been reasonably easy to set.
However I have a new G-shock Gulfman and to set the tide I need the "Lunitidal Interval" for Perth

The manual does not include this info for Perth; Melb, Syd, Cairns yes but nothing for the West Coast. I've also tried "googling" it and still had no luck

Can anyone help

Cheers