Very nice work (for a start)! Easy in every way. But it is not yet a simulator (too early). Here are my questions: The map(chart) is really very basic. It's not a sea chart. Did you use the official charts as a basis for the marker lights? And can we refer to the marine chart (f.e in Rotterdam the DKW type - see picture) to calculate the water heights? Are the tides present and do you use the official directory (with dates, times, NAP, heights, ....)? Concerning the reactions of some boats, it is coherent. There is still work to do to improve the reactions during certain maneuvers. To test this, I sailed from Rotterdam to Doordrecht (inland) and then I sailed down the "oud Maas" to the south of the Biesboch. That's where the application had a bug asking me to fill in my login and password. I didn't do it and the program stopped. Are you collecting user data now? These are my first questions, but overall I am satisfied if your goal is to make a real "simulator" that we could also consider using for training in boating schools. Thank you