In addition to the real time weather information from the AIS system, you also get access to a 5 day weather forecast from MeteoGroup. The company has since long delivered sea weather to commercial shipping. Simply tap the screen and get the forecast for the location you are interested of with a one hour resolution. You can also download a forecast from one of the weather stations that are available and access the data based on statistical data from the site for several years which greatly improves forecast accuracy.
In addition to the valuable AIS weather in real time, you also get weather forecasts in the PREMIUM service.