The application seeks to assist all users who have some connection to the ocean and it depends on the tide of the sea to choice the best time for surfing, sailing or even fishing. The different other mobile applications,is that does not use any external service to display the tide graph. Tides are calculated directly on the mobile phone using location configured, current date and moon phase. The algorithms of calculation is the same used in navigation systems. I have plan to add moon phase on graph on the next release. That I hope come soon! :)