I had a Casio watch in the early to mid 1980s that tracked the tides based on geo coordinates you entered and would tell you the best time to go fishing. They still promote them for this purpose:

https://www.casio.com/us/watches/types/activity/fishing-watc...

It looked something like this:

https://www.wilberforcewatches.com/products/casio-fish-en-ti...

Maybe the FT-100 or the more simple W-100?