Casio do have a tide watch, which presumably uses that algorithm: https://www.greatwatches.co.uk/collections/men/products/casio-w-753-2av-blue-moon-and-tide-gr

Casio do have a tide watch, which presumably uses that algorithm: https://www.greatwatches.co.uk/collections/men/products/casio-w-753-2av-blue-moon-and-tide-graph-dual-time-4-alarms-watch https://www.greatwatches.co.uk/collections/men/products/casi...