Tidegraph is a GPS app that lets you find out more information about the location and environment you are in, including the time, temperature, rainfall, wind speed, wind direction, wave height, atmospheric pressure, sea level, and so on. You can also check the current tide, and find out when the next high tide or low tide will happen.

It is useful not only for fishing but also for other activities in the sea such as surfing, diving, clamming, and more!

You can check the lunar calendar, which is a calendar based on the trajectory of the moon. It is useful for fishing since the lunar calendar depends on the phases of the moon and is a fundamental element in determining the fishing season.