Calculate the best fishing times, based on solunar calculations. Sunset, sunrise, moonset, moonrise, moon phase, length of the day, transit of the sun and moon. Offline app (don't uses Internet traffic). Full: Any location, Any date. Lunitidal interval. Estimate the tides at semidiurnal places.
If you have any trouble with the application contact me by the support email and not here, since without knowing specifically what the problem is I can't solve it.